I don't watch ragebait videos either, I watch either music videos, or stuff about my hobbies.
Ads would kill either. I hate random ads popping up.
As for sponsored content, I don't think that's under YT's control (other than that they allow it, imagine if it was forbidden: authors would complain about that arbitrary restriction). Sponsored content is like product placement, if you pay for a cinema ticket, why does the movie advertise products, cars, stores, etc? And is it the movie theater's fault?
Not sure why you need to mention the "renter" thing, this is literally a service you're paying for and that you can stop paying the minute it stops being useful to you. There's no vendor lock-in, just stop paying for Premium when if it ever becomes shit.
The OP is not saying Premium will always be good, they're saying why they find it useful to pay for Premium now.