Assign separate user roles to super admin and other user to new network site

add_action('wpmu_new_blog', 'wpmudev_new_blog_role', 300, 2);

function wpmudev_new_blog_role( $blog_id, $user_id ) {
	//Switch to new network site
    switch_to_blog( $blog_id );

    //Set default fallback user role 
	$default_user_role = 'administrator'; // Will be used as fallback user role, will be used if WP somehow can't create user role programitically 
	
	//Create free user role 
	$free_user_role = add_role( 'free', 'Free', array('delete_others_pages') );

	//Set default user role to Free only if it is successfully created 
	if( null != $free_user_role ){
		$default_user_role = 'free'; 
	}

	//If it is super admin
	if( is_super_admin( $user_id ) ){
		//first create the Master user role and then 
		$master_user_role = add_role( 'master', 'Master', array('setup_network') );

		////Set default user role to Master only if it is successfully created 
		if( null != $master_user_role ){
			$default_user_role = 'master'; 
		}
	}
    
    $user = new WP_User( $user_id );
    $user->set_role( $default_user_role );
    
    restore_current_blog();
}