The chance is not zero obv, but yeah the casinos are all legal, and rk/pk are known for their good relations with authorities, let's put it like that.
I would be more worried about cheating tbh, snooky casinos have a reputation for that, several stories are known, you can read some of that here also if you scroll back a bit more. And what is known is likely the proverbial tip of the iceberg. Obv that doesn't mean that all is rigged, probably the vast majority of games are fine. But it is something to be aware of...