Well, that's going to be a fun one. On the one hand, it is probably stolen money. On the other hand, one of the things that makes ponzi schemes particularly insidious - and proably one of the reasons JoelKatz has been banging on a lot about stolen money - is that they give canny investors who realise the whole shebang is a ponzi a financial incentive to insist as loudly and convincingly as possible that the scheme can't possibly be a ponzi, that they'll get their money back if they just wait, that anyone who claims otherwise is just trolling...

Under those circumstances, giving ponzi-suppoers the power to effectively impose a financial penalty on anyone who wants to point out that it is actually a ponzi is a pretty bad thing, and that's effectively what letting them pressuring Vandroiy into either taking this bet or shutting up only to try and take his winnings away as "stolen goods" after he wins is doing.