I don't want to pay for YouTube premium because I don't want YouTube music. I already have Spotify, why should I have a redundant service that I'm actively paying for.
I have no issues with paying for YouTube since at the end of the day video hosting on the scale that YouTube does cannot be profitable by ads alone.
I just wanna pay like £5 a month for just ad free viewing, none of the extra fluff crap like downloads or playing in the background or YouTube music.
Not to mention that to host content on the scale that YouTube does is ruinously expensive both in terms of bandwidth and cost. It's enough to choke out any smaller competitors almost immediately.