I'd never actually thought about the ad-free nature of Steem but that's a really interesting point. With all of the huge plusses it seems like only a matter of time before people start to shift, it's just so hard to tell if/when we're going to get that momentum. Personally my only reservation with just saying this is a sure fire home run is the knowledge that Google/Facebook HAVE to be looking into their own versions of a reward based blockchain. I would find it difficult to imagine they don't have people on this and with their already huge user base they could potentially decimate Steem if they do have somthing up their sleeves