Given that your polite but firm public request for a refund met with success, I'd suggest that others do the same before they waste time and money contacting attorneys and government agencies. It hasn't even been 24 hours since these latest threads appeared, so perhaps Pierre will appear and issue refunds to those that want them right away? I think those that want refunds should write something like
this, and then give Pierre a little time to respond before deciding how to move forward.
I absolutely do not believe that Pierre set out to steal deposits from people (it's almost absurd to accuse him of this), but I do believe he is in over his head, and sympathize with all those involved.