Just to add to this… some of the videos on YouTube are actual full ads. The content itself is an ad, so what should Google do? Ban YouTube Premium users from watching those videos? (I’m thinking like old Superbowl ads)
I don’t see how Google could possibly make a determination of what is and isn’t an ad, when Sponsor Block can barely figure out the categories. I doubt we could expect creators to self-identity sponsored segments, and I could easily see that system being abused.

People get really creative with their sponsors sometimes, doing entire skits to try and get you to keep watching. There’s no clear way to determine what an ad even is when it’s uploaded by the creator.