I'm disappointed in App Academy for this omission - they should be better than this.
That said, some perspective:
They have placed 400(?) people in the SF tech market through this tuition deferment scheme. Many of those hundreds didn't have the $10k-$18k up front needed for a bootcamp. Many of those people, myself included, consider attending App Academy a life-changing event. Easily the single most useful stretch of three months I've spent over the course of my twenties.
Their system of tuition deferment + rent free living on the floor in SOMA was unprecedented and a large gamble on their part. I'm very likely over-reacting given my strong feelings of gratitude to the school, but there's an under-current of entitlement in these posts I find objectionable.
They should have made certain that their complete tuition policy was clear, accurate, and very visible. That said, the harm you incurred was learning some minimal amount of ruby and and engaging in some screen shares. These are both skills that will be useful in any further interaction you have with web development, either bootcamp applications or job interviews. Respectfully, you have a long road ahead of you and much more potential unfairness.
Your experience with them does tarnish my view of App Academy slightly. However, the counter factual of no App Academy is a world in which literally hundreds of people would have been unable to pursue careers they find both financially and personally rewarding. Relative to that incredible accomplishment, this seems less damning.