Disable bunch of #$!@ in Catalina - Note about Big Sur: https://gist.github.com/pwnsdx/1217727ca57de2dd2a372afdd7a0fc21#gistcomment-3448419

toggle_Launch*.sh

#!/bin/bash

# IMPORTANT: Don't forget to logout from your Apple ID in the settings before running it!
# IMPORTANT: You will need to run this script from Recovery. In fact, macOS Catalina brings read-only filesystem which prevent this script from working from the main OS.
# This script needs to be run from the volume you wish to use.
# E.g. run it like this: cd /Volumes/Macintosh\ HD && sh /Volumes/Macintosh\ HD/Users/sabri/Desktop/disable.sh
# WARNING: It might disable things that you may not like. Please double check the services in the TODISABLE vars.

# Get active services: launchctl list | grep -v "\-\t0"
# Find a service: grep -lR [service] /System/Library/Launch* /Library/Launch* ~/Library/LaunchAgents

if [ "$#" -lt 1 ]; then
  printf "Usage: unload [doit|revert]"
  exit 1
fi

MODE=$1
BASE_DIR=./System/Library

# Agents to disable
# 'com.apple.speech.speechdatainstallerd' 'com.apple.speech.speechsynthesisd' 'com.apple.speech.synthesisserver' will freeze Edit menus
# 'com.apple.bird' will prevent saving prompt from being shown
TODISABLE=()

# iCloud
TODISABLE+=('com.apple.security.cloudkeychainproxy3' \
  'com.apple.iCloudUserNotifications' \
  'com.apple.icloud.findmydeviced.findmydevice-user-agent' \
  'com.apple.icloud.fmfd' \
  'com.apple.icloud.searchpartyuseragent' \
  'com.apple.cloudd' \
  'com.apple.cloudpaird' \
  'com.apple.cloudphotosd' \
  # Follow up notification
  'com.apple.followupd' \
  'com.apple.protectedcloudstorage.protectedcloudkeysyncing')

# Safari useless stuff
TODISABLE+=('com.apple.SafariBookmarksSyncAgent' \
  'com.apple.SafariCloudHistoryPushAgent' \
  'com.apple.WebKit.PluginAgent' \
  'com.apple.SafariPlugInUpdateNotifier' \
)

# # iMessage / Facetime
# # TODISABLE+=('com.apple.imagent' \
# #   'com.apple.imautomatichistorydeletionagent' \
# #   'com.apple.imklaunchagent' \
# #   'com.apple.imtransferagent' \
# #   'com.apple.avconferenced')

# Game Center / Passbook / Apple TV / Homekit...
TODISABLE+=('com.apple.gamed' \
  'com.apple.passd' \
  'com.apple.Maps.pushdaemon' \
  # Itunes video subscription stuff
  'com.apple.videosubscriptionsd' \
  'com.apple.CommCenter-osx' \
  'com.apple.homed')

# Ad-related
TODISABLE+=('com.apple.ap.adprivacyd' \
  'com.apple.ap.adservicesd')

# Screensharing
TODISABLE+=('com.apple.screensharing.MessagesAgent' \
  'com.apple.screensharing.agent' \
  'com.apple.screensharing.menuextra')

# Siri
TODISABLE+=(\
  'com.apple.siriknowledged' \
  'com.apple.assistant_service' \
  # This is what causes 'Security & Privacy' pane to show error dialog.
  # https://github.com/n00neimp0rtant/Sirious/blob/master/Layout/System/Library/LaunchDaemons/com.apple.assistantd.plist
  # 'com.apple.assistantd' \
  'com.apple.Siri.agent' \
  # Location-based suggestion
  'com.apple.parsec-fbf' \
)

# # VoiceOver / accessibility-related stuff
# # TODISABLE+=('com.apple.VoiceOver' \
# #   'com.apple.voicememod' \
# #   'com.apple.accessibility.AXVisualSupportAgent' \
# #   'com.apple.accessibility.dfrhud' \
# #   'com.apple.accessibility.heard')
# 
# # # Quicklook
# # TODISABLE+=('com.apple.quicklook.ui.helper' \
# #   'com.apple.quicklook.ThumbnailsAgent' \
# #   'com.apple.quicklook')

# Sidecar
TODISABLE+=('com.apple.sidecar-hid-relay' \
  'com.apple.sidecar-relay')

# Debugging process
TODISABLE+=( \
  # 'com.apple.spindump_agent' \
  'com.apple.ReportCrash' \
  'com.apple.ReportGPURestart' \
  'com.apple.ReportPanic' \
  'com.apple.DiagnosticReportCleanup' \
  # 'com.apple.TrustEvaluationAgent' \
)
  
# Screentime
TODISABLE+=('com.apple.ScreenTimeAgent' \
  'com.apple.UsageTrackingAgent')

# Others
TODISABLE+=('com.apple.telephonyutilities.callservicesd' \
  'com.apple.photoanalysisd' \
  # 'com.apple.parsecd' \
  'com.apple.AOSPushRelay' \
  'com.apple.AOSHeartbeat' \
  # 'com.apple.AirPlayUIAgent' \
  'com.apple.AirPortBaseStationAgent' \
  'com.apple.familycircled' \
  'com.apple.familycontrols.useragent' \
  'com.apple.familynotificationd' \
  'com.apple.findmymacmessenger' \
  # Maybe related to AirDrop
  # 'com.apple.sharingd' \
  # 'com.apple.identityservicesd' \
  'com.apple.java.InstallOnDemand' \
  'com.apple.parentalcontrols.check' \
  # 'com.apple.security.keychain-circle-notification' \
  # iCloud sync
  # 'com.apple.syncdefaultsd' \
  'com.apple.appleseed.seedusaged' \
  'com.apple.appleseed.seedusaged.postinstall' \
  'com.apple.CallHistorySyncHelper' \
  'com.apple.RemoteDesktop' \
  'com.apple.CallHistoryPluginHelper' \
  'com.apple.SocialPushAgent' \
  'com.apple.touristd' \
  'com.apple.macos.studentd' \
  # ???
  # 'com.apple.KeyboardAccessAgent' \
  'com.apple.exchange.exchangesyncd' \
  'com.apple.suggestd' \
  'com.apple.AddressBook.abd' \
  'com.apple.helpd' \
  'com.apple.amp.mediasharingd' \
  'com.apple.mediaanalysisd' \
  'com.apple.mediaremoteagent' \
  'com.apple.remindd' \
  # ???
  # 'com.apple.keyboardservicesd' \
  'com.apple.AddressBook.SourceSync' \
  'com.apple.telephonyutilities.callservicesd' \
  'com.apple.mobileassetd' \
  'com.apple.CalendarAgent' \
  # Siri's proactive knowledge collector...appearantly
  'com.apple.knowledge-agent')

TODISABLE+=(
  'com.apple.RemoteManagementAgent' \
  'com.apple.EscrowSecurityAlert' \
  'com.oracle.java.Java-Updater' \
  'com.apple.routined' \
  'com.apple.contacts.donation-agent' \
  'com.apple.AMPArtworkAgent' \
  'com.apple.diagnostics_agent' \
  'com.apple.photolibraryd' \
  'com.apple.WiFiVelocityAgent' \
  'com.apple.accessibility.MotionTrackingAgent' \
)

for agent in "${TODISABLE[@]}"
do
  if [ $MODE == "doit" ]; then
    mv $BASE_DIR/LaunchAgents/${agent}.plist $BASE_DIR/LaunchAgentsIgnored/${agent}.plist.bak
  else
    mv $BASE_DIR/LaunchAgentsIgnored/${agent}.plist.bak $BASE_DIR/LaunchAgents/${agent}.plist
  fi
  echo "[OK] Agent ${agent} disabled"
done

# Daemons to disable
TODISABLE=()

# iCloud
TODISABLE+=('com.apple.analyticsd' 'com.apple.icloud.findmydeviced')

# Others
TODISABLE+=('com.apple.netbiosd' \
  'com.apple.preferences.timezone.admintool' \
  'com.apple.remotepairtool' \
  'com.apple.security.FDERecoveryAgent' \
  'com.apple.SubmitDiagInfo' \
  'com.apple.screensharing' \
  'com.apple.appleseed.fbahelperd' \
  'com.apple.apsd' \
  'com.apple.ManagedClient.cloudconfigurationd' \
  'com.apple.ManagedClient.enroll' \
  'com.apple.ManagedClient' \
  'com.apple.ManagedClient.startup' \
  'com.apple.locate' \
  'com.apple.locationd' \
  # 'com.apple.eapolcfg_auth' \
  'com.apple.RemoteDesktop.PrivilegeProxy' \
  'com.apple.mediaremoted'\
  'com.apple.ReportCrash.Root' \
  'com.apple.CrashReporterSupportHelper' \
)

TODISABLE+=( \
  'com.apple.bluetoothReporter' \
  'com.apple.systemstats.daily' \
  'com.apple.systemstats.analysis' \
  'com.apple.systemstats.microstackshot_periodic' \
  'com.apple.cloudphotod' \
  'com.apple.rapportd' \
  'com.apple.findmymacmessenger' \
  'com.apple.wifivelocityd' \
  'com.apple.icloud.searchpartyd' \
)

for daemon in "${TODISABLE[@]}"
do
  if [ $MODE == "doit" ]; then
    mv $BASE_DIR/LaunchDaemons/${daemon}.plist $BASE_DIR/LaunchAgentsIgnored/${daemon}.plist.daemon.bak
  else
    mv $BASE_DIR/LaunchAgentsIgnored/${daemon}.plist.daemon.bak $BASE_DIR/LaunchDaemons/${daemon}.plist
  fi
  echo "[OK] Daemon ${daemon} disabled"
done