Newpipe (and all the other ad blockers) are playing cat and mouse with them. They make some changes which screw up blockers, blockers patch and return to service pretty quickly. I couple months ago they went so far as to force javascript proof of work, I was able to setup yt-dlp with the javascript engine in like 5 minutes and keep going.

They target different things, sometimes the try to block high quality streams, sometimes it's not logged in streams, sometimes it's streams from certain ips. They keep moving the cheese, deleting this rss feed or that stream type. At some point, they'll implement actual encryption like widevine and make it actually difficult to get at the streams, at which point, we'll just screen record, commercial skip and the best of the best will end up in torrents.

Their music quality is general marginal. Research soulseek.