Turns off the Unsplash CDN hotlinking when using the Unsplash plugin ( for paranoid people )

splishsplosh.php

<?php
/**
 * Plugin Name: Splish Splosh
 * Version: 1.0.1
 * Author: Tom J Nowell
 * Author URI: https://tomjn.com/
 * Description: Turns off the Unsplash CDN when using the Unsplash plugin
 * Requires PHP: 5.6
 * Requires at least: 4.9
 * License: GPLv2+
 * License URI: http://www.gnu.org/licenses/gpl-2.0.txt
 **/

add_action(
	'plugins_loaded',
	function () {
		$plugin = \Unsplash\get_plugin_instance();
		$hotlink = $plugin->hotlink;

		remove_filter( 'content_save_pre', [ $hotlink, 'wp_get_attachment_url' ], 10 );
		remove_filter( 'image_downsize', [ $hotlink, 'image_downsize' ], 10 );
		remove_filter( 'the_content', [ $hotlink, 'hotlink_images_in_content' ], 99 );
		remove_filter( 'wp_calculate_image_srcset', [ $hotlink, 'wp_calculate_image_srcset' ], 99 );
		remove_filter( 'wp_get_attachment_image_src', [ $hotlink, 'wp_get_attachment_image_src' ], 10 );
	},
	1000,
	0
);