Ah yeah, I get what you mean. But basically anything where people cannot directly download a video but have to resort to some additional software to download the video, that's basically piracy.

Now some people won't know about yt-dlp and the sorts, so they maybe even do go for torrents, again, why not? If you are such a fan of Mr. Beast (no judgement here) and that dude has surely hundreds if not thousands of videos by now, a torrent could include all of a series of his videos that you are interested in. So it is actually then more convenient to torrent them instead of downloading them one by one.

Tldr different people have different interests and usecases