I'd gladly pay for YouTube without ads if I trusted that it would remain ad free, but the track record from various companies on this is not good.
Youtube premium has been ad-free for 10 years. What kind of track record do you need? 20 years? 100 years?
Netflix and other streaming sites have ads on some paid subscriptions. First they start with ad free subs, then introduce ads and introduce a higher priced tier to get rid of ads