Could be one of the many reasons such as ensuring their favorite creators get paid for their views and end users not being tech savvy enough to know about ad blockers and NewPipe.
That's a poor reason. Google takes a big cut, just pay the YouTuber(s) directly through their favourite donation service; most have at least one these days. This is like when people claim they pay for Spotify because they "care about supporting musicians". It's delusional at best and a straight up lie at worst.
That's a good approach. But people aren't tech savvy enough to install NewPipe in order to avoid ads. Paying for YT premium is the most user friendly way to avoid ads and support creators.
Hi there! Looks like you linked to a Lemmy community using a URL instead of its name, which doesn't work well for people on different instances. Try fixing it like this: !libretube@feddit.rocks