All the meaningful transaction are likely done through another server. Mine craft is just a way to interact but once you select your bet that could be sent to another server to log your bet and that server could send the results of your bet back. So your account size in mine craft doesn't matter. Also mine craft wouldn't know ahead of time the correct answers. Which also explains the delay in the video when digging for mines. All that matters is that log recorded on the other server for payment, so mine craft is only serving as a Interface to place bets and see results.
