Hide Subscriber Users from BuddyPress member Directory

hide-subscribers.php

<?php
/**
 * Excludes users from BuddyPress Members list.
 *
 * @param string $qs Query string.
 * @param string $object object loop identikfier.
 *
 * @return string
 */
function bpdev_exclude_users( $qs = false, $object = false ) {

	if ( $object != 'members' ) { // hide for members only.
		return $qs;
	}

	// comma separated ids of users whom you want to exclude.
	$excluded_users = join( ',', bpdev_get_excluded_user_ids() );

	$args = wp_parse_args( $qs );

	// check if we are searching for friends list etc., do not exclude in this case.
	if ( ! empty( $args['user_id'] ) ) {
		return $qs;
	}

	if ( ! empty( $args['exclude'] ) ) {
		$args['exclude'] = $args['exclude'] . ',' . $excluded_users;
	} else {
		$args['exclude'] = $excluded_users;
	}

	$qs = build_query( $args );

	return $qs;
}

add_action( 'bp_ajax_querystring', 'bpdev_exclude_users', 20, 2 );

/**
 * Retrieves an array of user ids to exclude.
 *
 * NOTE:- It is not an efficient idea if you want to exclude thousands of users. There are better ways.
 *
 * @return array
 */
function bpdev_get_excluded_user_ids() {
	/*
	// Example:- Excluding known user ids
	$query = array(1,2,3); // Please use the actual user ids instead of 1,2,3
    */
	// Example:- Single role exclusion.
	// This excludes all subscribers. Change the role you want to exclude.
	$query = array(
		'role'   => 'subscriber', // you can change the role to any role you want to exclude.
		'fields' => 'ID'
	);

	/*
	// Example:- Multiple roles Exclusion
	$query = array(
		'role__in' => array( 'subscriber, contributor' ),  // List of roles to exclude.
		'fields'   => 'ID'
	);
   */

	/*
	// Example: Limiting to certain roles only.
	$query = array(
		'role__not_in' => array( 'subscriber, contributor' ),  // List of roles to include.
		'fields'   => 'ID'
	);
	*/

	return get_users( $query );
}

Super late reply, but for @Hastibe and anyone else who wants to exclude all but one role, change the exclude to include.

// Helper for fetching all IDs to include. Returns an array in this example.
$included_user_ids = my_function_to_fetch_all_users_by_role();

$args = wp_parse_args( $qs );
$args['include'] = implode( ',', $included_user_ids );

$qs = build_query( $args );

I am not a developer. Can anyone tell me where to put the user IDs to include in the last post by @scottlee ? For example, if I want to exclude all user roles from the buddypress directory except a user role called "Premium", where do I put that? Can I add more than one user role? Would be great if someone could post a definitive code with an example in it. Thanks in advance to whoever does this.

I am sorry for not keeping up with the comments here. I have updated the code with examples for multiple roles exclusion. Also, I will recommend using bp_after_has_members_parse_args instead of the bp_ajax_querystring that we have used.
Here is a link to one of my old post about the same.
https://buddydev.com/hiding-users-on-buddypress-based-site/