I’d happily pay for a service if I could have a guarantee, with legal teeth (like a service level agreement with truly massive penalties for breach), that the service won’t ever do any of the following:
Put an ad in front of my face.
Sell my personal information.
I used to pay for some services to get the “ad-free” version, but almost invariably this chain got subsequently followed: ad-free → opt-in “curated” ads → opt-out “curated” ads → “curated” ads → dropping all pretense of there being any advantage to paying as the site becomes ad-o-rama.