Its the only way to make anonymous payments (XMR Monero) in a world where everything tracks and spies on you. And it's not only used to buy illegal stuff https://kycnot.me/ . I think of it like the TOR browser. Its great for people who are trying to escape an authoritarian government, but it can be used for bad things as well. But it should exist as I believe privacy is a human right.
You can always download the video with yt-dlp and watch it offline.