They also should realize that unless they use a completely new wallet, its very easy to track a given wallet just by looking at the change addresses. Just because your bet comes from a new bitcoin address, doesn't mean there isn't a trail with your other previously used addresses.
That's why I find it pretty surprisingly why they even bother going on those forum and complaining after they got caught trying to steal.
You are welcome to check my address as far back as you would like. I was not trying to steal anything, I was just playing and they decided not to issue my payout due to their bs logic (I was betting big, therefore I am a double-spender).
This is my transaction:
https://blockchain.info/tx/09f0c68ade9a2d89dd0bd7a64d35af99ab0ffaa2a161996088a8f007f16b5bf9