I don’t like that a paid plan gives worse experience than free tools. For example, the downloads not being files you can store indefinitely and play by anything. Or not all ads being guaranteed to be blocked.

Edit: it would not fit my usecases entirely. First - I listen to a lot of Youtube videos as podcasts, so the audio downloads have to be in my podcast app together with downloads from my RSS feeds, so app-locked ones would be useless. And second - those would be useless for archival. Something increasingly necessary given how Youtube has already deleted some of my favorite videos.