I don't think there's anything ethical about stringing your employees along for 3 months without pay, regardless of how successful you may have been in the past: https://news.ycombinator.com/item?id=13140938
Morality is a spectrum, and you can only make a judgement call on it when all the details are known, which right now they aren't.
Robbery? Now that's a different thing. But theft? Close enough.