First of all, isn't YouTube Music dead? Didn't it die twice already? Secondly, I don't know. I didn't look into YouTube Premium precisely because they're pushing it way too hard. I don't trust Google, I don't trust them handling ads and child-related content on YouTube right, after various YouTube Kids fiascoes. I don't trust people who are pushing their products/services this hard - so far, I was never wrong. Whatever curiosity I had about YouTube Premium, they burned it by the third time in a day I got interrupted by a full-screen "activate a trial" ad, optimized to have distracted people subscribe by mistake.
Not to mention, the way YouTube Premium story evolves, this really feels like extortion. It technically isn't, and they're in their rights, but perception matters - and because of that, I'm willing to spend a lot of effort, and even a lot of money with someone else, just to not have to deal with YouTube Premium, YouTube ads and other YouTube bullshit, while retaining easy access on the relatively infrequent occasion I want to play something from their catalogue.