Most services have now light premium-tiers, where they do show ads. And then there are the rats like Amazon, who just add them to the normal tiers, and offer an additional service to not show ads.

YT has a Premium Lite paid tier (at least in the U.S.) that does show ads on music and in certain other areas of the app, such as shorts, searching, browsing, etc.

I don't paid anything to YouTube and I don't see any ads. Because I block ads.