Lock editing of BuddyPress profile fields. Plugin here: https://github.com/zacwasielewski/buddypress-lock-profile-fields/

edit.php

<?php

/*
This snippet hides locked fields on the profile edit form.

Add to `wp-content/plugins/buddypress/bp-templates/bp-legacy/buddypress/members/single/profile/edit.php`
immediately after <?php while ( bp_profile_fields() ) : bp_the_profile_field(); ?> (near line 22):
*/

<?php if ( in_array( bp_get_the_profile_field_name(), bp_get_locked_profile_fields() )) { continue; } ?>

functions.php

<?php

/*
Add to the end of your theme's `functions.php`, and customize $bp_locked_profile_fields if necessary:
*/

global $bp_locked_profile_fields;
$bp_locked_profile_fields = array(
  'Assumption of Risk (please initial)',
  'Waiver (please initial)',
  'Indemnification (please initial)',
  'Acknowledgment (please type your full name and date)'
);

function bp_get_locked_profile_fields() {
  global $bp_locked_profile_fields;
  return $bp_locked_profile_fields;
}

function bp_get_locked_field_ids( $locked_field_names ) {
  $ids = array();
  while ( bp_profile_fields() ): bp_the_profile_field();
    $field_name = bp_get_the_profile_field_name();
    if ( in_array($field_name, $locked_field_names )) {
      $ids[] = bp_get_the_profile_field_id();
    }
  endwhile;
  return $ids;
}

function bp_exclude_locked_field_ids( $ids_string ) {
  $locked_ids = bp_get_locked_field_ids( bp_get_locked_profile_fields() );
  $ids = explode(',',$ids_string);
  return implode(',',array_diff($ids, $locked_ids));
}

function bp_modify_locked_profile_field_type( $type ) {
  $locked_field_names = bp_get_locked_profile_fields();
  $field_name = bp_get_the_profile_field_name();
  if ( in_array($field_name, $locked_field_names )) {
    return 'locked';
  }
  return $type;
}

function lock_profile_edit_fields() {
  add_filter( 'bp_get_the_profile_field_ids', 'bp_exclude_locked_field_ids', 10, 1 );
  add_filter( 'bp_the_profile_field_type', 'bp_modify_locked_profile_field_type', 10, 1 );
}
add_action( 'xprofile_screen_edit_profile', 'lock_profile_edit_fields');