Okay, what are they? And I mean cons from the POV of users (and hosts are users too in this sense) not from the POV of an unnecessary commercial organisation overlaid (overlain?) on the infrastructure.

I'm not being snarky here, I'd really like to think a new thought.

(To be fair, or just contrary, I kinda feel that all the porn and ads might due with a little reduced service, but I'm not megalomaniacal enough to think that I should get to decide for everyone else..)