I don't disagree about the structure problems with apps and sites that are free with ads.
I do worry that without that free option users just simply wouldn't ever try anything new and just stay where they are new. If everything costs money to move ... I worry nobody moves and everything stagnates. Facebook and similar, now in an even stronger position.
Users, for worse, like it this way and make free with ads the best route because of their choices. Users with their choices incentivize this system too ...