Reverts renames every time someone rechanges your nickname

rename_revert.py

#!/usr/bin/env python3
# SPDX-FileCopyrightText: 2020-2021 Nathaniel Fitzenrider <https://github.com/nfitzen>
#
# SPDX-License-Identifier: CC0-1.0

# DISCLAIMER: SELF-BOTTING CAN GET YOU PERMANENTLY BANNED FROM DISCORD! USE AT YOUR OWN RISK!

import discord

disclaimer = "DISCLAIMER: SELF-BOTTING CAN GET YOU PERMANENTLY BANNED FROM DISCORD! USE AT YOUR OWN RISK!"

class Bot(discord.Client):
    """Main bot class."""

    def __init__(self, **options):
        super().__init__(**options)
        self.nickChanges = {}

    async def on_member_update(self, before, after):
        """Automatically updates nickname upon change."""

        try:
            hasChanged = self.nickChanges.pop(after.guild.id)
        except KeyError:
            if after == self.user and after.nick != before.nick:
                # There's probably a better way to do this
                self.nickChanges[after.guild.id] = True
                changedNick = after.nick
                await after.edit(nick=before.nick)
                print("Name changed from",changedNick,"to",before.nick)
    async def on_ready(self):
        global disclaimer
        print(disclaimer)

def get_token():
    try:
        with open('token.txt') as f:
            token = f.read()
    except FileNotFoundError:
        token = get_token_prompt()
    return token

def get_token_prompt():
    global disclaimer
    instructions = """To obtain your token, go to discord.com, press F12/CTRL+SHIFT+I, open the
Network tab, and click "Open Discord." Then, filter the URL for "api," click on
the top one or so, and look on the right under HTTP headers for "Authorization:"
(you may have to scroll down a bit). Paste that here.
"""
    print(disclaimer)
    print(instructions)
    token = input("Input your Discord token: ")
    saveAns = input("Save to token.txt? (Y/N) [Y] ")
    if not saveAns.lower().startswith('n'):
        with open('token.txt', 'w') as f:
            f.write(token)
    return token

bot = Bot()

token = get_token()

while True:
    try:
        bot.run(token, bot=False)
    except discord.errors.LoginFailure as e:
        print(e)
        token = get_token_prompt()
    except:
        quit()