/**
 * This code snippet modifies the "Review Reminder" WooCommerce Email.
 *
 * @param bool $skip        Whether the email should be skipped for the provided order
 * @param \WC_Order $order  The WooCommerce Order object
 *
 * @return bool - true if the Review Reminder email should be skipped, false otherwise.
 */
add_filter('site-reviews-notifications/product/reminder/skip', function ($skip, $order) {
    if (get_post_meta($order->get_id(), 'user_gave_consent', true)) {
        return true; // Skip if user did not give consent
    }
    $return $skip;
}, 10, 2);