One very important fact is, that to implement an ads system, negotiating deals with advertising agencies or the likes would be a really huge project and require ... manpower.

That said, i definitely think you are right on your point and i see a natural fit with DLT eliminating the middle man. But only to some extend. There will still be a need for content aggregators. Otherwise, it would be a royal mess for both consumers and advertisers having to negotiate deals with a gazillion people.

Personally, I'd be fine about being exposed to advertising as long as it doesnt completely steal focus from the actual content I'm reading. And the option to have all users pick at least 2 or 3 areas on which they would accept advertisement seems like a fairly easy and straightforward implementation. But i fear that it would be everything 'around it' that would require massive amount of work and likely some up front investing too.