I recommend Nebula for any channels which are on there; they make much more money that way. I recommend NewPipe for channels that aren't on Nebula; let YouTube die if it needs to be so user-hostile to survive. (Yes, I know it's a lot easier for me to say when I haven't staked my livelihood on YT and I wouldn't be the one being sacrificed if YT were to actually die. I don't really have an answer to that except that I'm supporting alternatives where I can.)
Sorry, no, paying for this "service" would be the same as paying the mafia for their protection service.
Google doesn't embed or control those adverts and doesn't benefit directly from them, and they might not want to anger the minority of their user base with this addon any more than they already are by forcing yet more unskippable ads on them.
If the seek bar was disabled while a "this video is sponsored by" segment started playing, I would just stop using YouTube immediately.
As a YouTube Premium subscriber, where I think the argument breaks down is how absolutely garbage their recommendation algorithm has become. While I don't agree with the tactic, I can see why YouTube would push content that keeps the users engaged/pacified and don't see why exactly they would use the same shitty algorithm on people who pay to not see ads. A great up-sell could be better control of the recommendations, perhaps set a "target profile" for yourself.
For the free-tier I still think YouTube dialed the monetization knob up way to fare. There are currently way to many ads and the quality of those ads is rather low and their relevance is questionable. I don't blame YouTube for attempting to crack down on ad-blockers, but they need also need make ads more tolerable. The current allowed ads, their runtime and placement basically makes the actual videos impossible to watch.
YouTubes current quest for ever growing revenue has resulted in an insane manipulation of its users, pushing ever more brain numbing content and its going to cost them users if they also crack down on ad blocking to hard, while not increasing the incentive to pay for Premium. It's a vicious spiral of pushing ads so hard that more and more people tries to avoid them.
Stop censoring lawful creators, and I will buy premium.