Removes the price from all add to cart buttons
<?php
/*
 * Plugin Name: Easy Digital Downloads - Remove Price
 * Description: Removes the price from all add to cart buttons
 * Author: Easy Digital Downloads
 * Author URI: https://easydigitaldownloads.com/
 * Version: 1.0
 */

function pw_edd_remove_price( $args ) {
	
	$args['price'] = 'no';

	return $args;
}
add_filter( 'edd_purchase_link_defaults', 'pw_edd_remove_price' );
To implement this snippet on your site, create a brand new, empty WordPress plugin and paste the above code inside.