Allow multiple reviews but only the first has ratings

gv_single_rating.php

<?php // DO NOT COPY THIS LINE

add_filter( 'gv_ratings_reviews_ratings_allowed', function ( $is_allowed, $_, $__, $view ) {
	if ( ! $is_allowed || ! $view instanceof GravityView_View ) {
		return $is_allowed;
	}

	global $gv_ratings_reviews;

	$post_bridge_comp  = $gv_ratings_reviews->component_instances['post-bridge'];
    $post_id = $post_bridge_comp->create_bridge($view->getCurrentEntry());
    if ($post_id instanceof WP_Error) {
        return $is_allowed;
    }

	$user                               = wp_get_current_user();
	$reviewdata['comment_post_ID']      = $post_id;
	$reviewdata['comment_author']       = $user->user_login;
	$reviewdata['comment_author_email'] = $user->user_email;

	$left_review = GravityView_Ratings_Reviews_Helper::is_user_has_left_review_before( $reviewdata );
    // If the user left a review, they are NOT allowed.
	return ! $left_review;
}, 10, 4 );