Using YouTube enough for ads to bother someone does not imply it’s “enough” to pay for. There’s nothing paradoxical about it.

Humans don’t value things as a binary decision between it either being worth it as free or equal to the cost it’s being sold at. Everyone has a price point for a service they think is fair, for which they’ll start seeking alternatives when exceeded. This is how markets work.

Time spent does not correlate with cost-independent value. This is doubly true with social media platforms.