Woocommerce every 2 product the third (randomly) is free

utilities.php

<?php
add_action( 'wp', 'add_free_product_to_cart' );



function add_free_product_to_cart( )    {
if (!is_admin()) {
		$count = 1;
		$count_free = 0;

		$query = new WC_Product_Query();
		$products = $query->get_products();


        foreach ( WC()->cart->get_cart() as $cart_item_key => $item ) {

        	if(isset($item['variation']['Type'])){
	        	if($item['variation']['Type'] =='Free Item') {
	        		WC()->cart->remove_cart_item($item['key']);
	        	}
        	}

		}


		foreach ( WC()->cart->get_cart() as $cart_item_key => $item ) {

			for ($i=0; $i < $item['quantity']; $i++) { 

				if( $count % 3 == 0) {


					

					$randid = $products[rand(0, count($products)-1)]->get_id();


					WC()->cart->add_to_cart( $randid, 1, 0, [ 'Type' => 'Free Item' ] );
				}

				$count++;
			}
		}

        foreach ( WC()->cart->get_cart() as $cart_item_key => $item ) {

        	if(isset($item['variation']['Type'])){
	        	if($item['variation']['Type'] =='Free Item') {
	        		$item['data']->set_price(0);
	        	}
        	}

		}
		}



	}
?>