I've gotten a couple of acceptances so far and I don't even have an academia.edu page ... (in fact, you can't find very much at all if you google me, except for a couple of minor things already included on my CV)
Edit: I'm very tired, and it seems to me like maybe my contribution here was beside the point. I think the main thing I wanted to communicate is that there may be enough applicants where googling is useless, and so maybe some places just don't do it or at least not routinely, and when people do get hits it's because some professor thought 'Hm, interesting, let me see if this person has other stuff online'