But if you somehow have a 100% correct prediction you are now "insider trading" and that is not allowed because all gambling.. ahem, all betting... hmm... All predicting much be "fair" and "random" and definitely not too good.
It's very simple. You can bet and lose as much as you like, but if you bet and win, you are clearly cheating somehow.
So they want you to believe, but I find I cannot take such claims seriously.
Wanna bet?
If I did, I'd be on one of the prediction markets.
I think the exclamation point at the end of GP's message is intended to indicate sarcasm - GP also doesn't take these claims seriously.