I participated in App Academy. The program had strengths and weaknesses, but to their credit, they culled the class at the halfway point, and gave folks who had no chance of getting hired within a reasonable timeframe a full refund of their deposit.
There was some bait-and-switch with regard to their "free unless/until you get a job" pitch. I think the competition for students in the space is increasing pressure, and oversight is probably a necessary thing.
In my opinion, students who went on to A-list companies probably could have gotten a job without the bootcamp. But the offer is still compelling if you get a couple months of intense introduction to an in-demand framework, and don't pay anything out-of-pocket (App Academy collects when you get hired).