first of all you are limited to 50 mbtc withdraws 3 or 4 times a month. you cannot withdraw more than this in a single month its a limit set by them. this was a bit annoying but not a huge issue as they were always paying out within a single day. but my last withdraw that got processed took a whole 7 days to be completed which is not acceptable.
First of all, this casino does not have a very good reputation here. I don't think anyone who has been active on the forum would try this casino. If we talk about their withdrawal rules, it is set by the platform so they can afford to pay players. They reduced the withdrawal limit because they have very limited bankroll size and if they pay the whole amount that players win, they will be bankrupt.
They are running the platform with the very low bankroll, and it is not rocket science. You should leave this platform asap. Crypto casino taking a seven days to release a withdrawal, it's a nightmare for a gambler.