Unfortunately I don't think it will do any good because now after Pirate every deposit taker is simply bombarded with baseless accusations and labeled as a scammer without a single shred of evidence.
There was mountains of evidence from the very beginning. The two most obvious pieces of evidence were: 1) He was vague and even contradictory about his actual method of making money and everything he did say made no sense. 2) If he had a way to make so much money, the first thing he would do is pay down ultra-high-interest debt, but he was actually acquiring more of it.
If you think that isn't evidence, then I suspect you don't understand what evidence is.
As for mybitcointrade, the evidence is in the offer. Basically, what they've said is "Lend me $50,000. I'll go to Vegas and gamble it. If we win, we split the money. And if I lose the money, you lose. Oh, and I won't tell you how I lost your money if I do, you'll have to take my word for it." Even if all of that is completely true, and even if they do everything they promise, it's still an obvious scam. Only a complete fool would send someone their money on terms like that.