I think the claim is that Wikileaks is getting a crapton of publicity and hence donations and isn't really a non-profit organization, but in fact is designed to make the Wikileaks founders rich.

I think the solution to this claim is obvious: Wikileaks's budget should be 100% transparent to everybody. Is it? I don't know where it is. If it turns up somewhere, then we can judge for ourselves whether it is a scam; if it is not available, then Wikileaks is a hypocritical organization and the claim is probably true.