BuddyPress.org

You can use the ‘bp_after_has_members_parse_args’ hook to filter for random users adding it to the bp-cuscom.php file.

function random_users( $args ) {

	if ( is_admin() && ! defined( 'DOING_AJAX' ) ) {
		return $args;
	}

	$args['type'] = 'random';

	return (array) $args;
}
add_filter( 'bp_after_has_members_parse_args', 	'random_users', 10 );