There are a lot of different casinos. Cryptocurrencies are ideal for casinos. Everyone loves anonymity. But the question is, will they allow you to withdraw large winnings in an anonymous casino?
This varies from casino to casino but also from player to player. Two players may attempt to withdraw the same amounts from the same casino. One can go through without any issues while the other one can be initially stopped with the player being asked various questions depending on what the casino suspects the player did. Red alarms can be triggered if the casino or game operators believe gamblers are playing from restricted locations, abusing bonuses, having multiple accounts, or might be returning players who were banned in the past for breaking T&Cs.
It seems to me that 2 people cannot behave exactly the same. However, there are certain fraud schemes and experienced casinos all know them. If a person cheats, the casino simply won't pay him the bonus, so the meaning of fraud is negated.