What we have here is a situation where someone appears to be actually beating the house edge over many thousands of bets.
Operating a gambling site myself I can tell you it's absolutely normal people starting with 0.1 BTC and leaving with 2 BTC profit but those people dont call much attention. It's not that remarkable to make 2000BTC when starting with 100BTC. The difference is: not many people make so high bets and the long term for house profit might get a bit longer.