The key is public by nature — it travels in the page source. It only works on junkr.party: a request from anywhere else is served, but never counted.
pk_12d87af95e3ebaa9257d8d5f
<script src="https://relay.mib.news/w.js" data-key="pk_12d87af95e3ebaa9257d8d5f" data-count="4" async></script>