mypmpro-delete-spam-users.php

<?php //do not copy

/**
 * This recipe can either be run by adding /wp-admin/?cleanup=1 to your URL
 * Or add the mypmpro_cleanup_spam_users function as a callback to a cron using WP Crontrol
 *
 * USE AT YOUR OWN RISK - Bulk deleting user data is irreversible and can result in active memberships
 * and subscriptions being cancelled.
 * 
 * Add this code to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function mypmpro_cleanup_spam_users(){
    
    // Get the 'abandoned-signup' term.
    $abandoned_signup_term = get_term_by( 'slug', 'abandoned-signup', 'pmpro_abandoned_signup' );
	if ( empty( $abandoned_signup_term ) ) {
		return;
	}

	// Get all users with the 'abandoned-signup' term.
	$abandoned_signup_users = get_objects_in_term( $abandoned_signup_term->term_id, 'pmpro_abandoned_signup' );
    
    $limit = 500;

    if( ! empty( $abandoned_signup_users ) ){
        $abandoned_signup_users = array_slice( $abandoned_signup_users, 0, $limit );
        foreach( $abandoned_signup_users as $user_id ){
            if( ! pmpro_hasMembershipLevel( null, $user_id ) ) {
                //They don't have a membership level so we can delete them.
                wp_delete_user( $user_id );
            }
        }
    }

}
if( isset( $_GET['cleanup'] ) && $_GET['cleanup'] == '1' ){
    add_action( 'admin_init', 'mypmpro_cleanup_spam_users' );
}