The key is public by nature — it travels in the page source. It only works on pladrom.com: a request from anywhere else is served, but never counted.
pk_68e3e0200bd1782a7464e44e
<script src="https://relay.mib.news/w.js" data-key="pk_68e3e0200bd1782a7464e44e" data-count="4" async></script>