I'm not convinced it was "stolen", and I think it's pretty crappy of you to suggest that it was unless you know something the rest of us don't.
TipJoy almost certainly has a product roadmap of some kind. Theoretically it's possible that they pushed what they were in the middle of aside 15 days ago to attack this and managed to get it done and launched by today... But I think it's just as likely that they were already working on it.
Even if they DID steal it from Twitpay, the idea certainly didn't originate there. http://www.alleyinsider.com/2008/6/how-twitter-will-be-worth... (from June)
He didn't say you had to be part of a viable startup to play.
Anyone reading this is welcome to the game. And if you want an excuse to move to Boston, tipjoy is hiring: http://tipjoy.com/jobs
Given this fundraising environment, it might be a good financing strategy too.
Not saying it's impossible, just saying it's far from a slam dunk.