old-new-wiaas/backend/app/plugins/wiaas/includes/class-wiaas-user.php

<?php

defined( 'ABSPATH' ) || exit;

/**
 * Class Wiaas_User
 */
class Wiaas_User {

	public static function init() {
		add_action('init', array(__CLASS__, 'load_user_organization'));
		add_action('plugins_loaded', array(__CLASS__, 'remove_default_user_groups'), 30);
	}

	public static function load_user_organization() {
		if (class_exists('WP_User_Taxonomy')) {
			require_once dirname( __FILE__ ) . '/user/class-wiaas-user-organization.php';

			new Wiaas_User_Organization();
		}
	}

	public static function remove_default_user_groups() {
		remove_action( 'init', 'wp_register_default_user_group_taxonomy' );
		remove_action( 'init', 'wp_register_default_user_type_taxonomy'  );
	}
}

Wiaas_User::init();