You can get ad free Youtube with Firefox plus ublock origin for free. There are even Firefox extensions to skip the paid sponsor ads in every youtube video nowadays. There are also countless Youtube downloader programs out there. You don’t need to pay for it at all to get the features that YouTube premium offers.
Paying to support content creators is the only reason I would consider YouTube premium unless I was very tech illiterate, I guess. YouTube music also seems somewhat worth the price, in my opinion.
Edit: This comment can come off as condescending. I don’t mean it as such, if you pay for YouTube premium that’s cool. I just wanted to make it known that people don’t have to pay YouTube money to get those features if they don’t want to.