The only reason why I ever use these services is because they killed off any alternatives through anti competitive practices. And I hate it every time because they are awful and disrespect me every single millimeter of the way.
You are arguing on the premise that ads would somehow be a fair exchange. That is simply the opposite of the truth. Ads are parasitic. Services with ads are almost always worse than services without, not just by having ads but also in every other way. Ads do not incentive quality, they incentive treating your users as prey and feeding them SEO slop.
I want to compensate people for actual beneficial work they do. But with most for profit internet services that is simply not possible. If you give them a finger they will take your whole arm. For exampme I want to buy good movies. But I simply cannot. All I can "buy" is a pinky promise from them to let me watch a movie under their conditions which they can change at any time under their sole discretion and they can just revoke that possibility for me completely at any time. Would I pay for Netflix they would only give me 720p no matter how much money I give them, because I have to much control over my own hardware for them.
There are exceptions to this that I happily pay for, but those are all niche services that cater to the small group of people like me.