This is one of the bigger sites. Actually they are on valves list of the casinos, they want to close down.
But CSGOCrash is promising, to do everything needed to continue their site.
Most likely they gonna find a deal with valve, and the site will stay.
They even have different servers you can play on.
I think it's also one of the most fair CSGO casinos. You can make quiet some profits, if you get lucky.
You can redeem the code:
CSG-73213
to get 100 coins for free. The current maxprofit per bet is 7,685,000 which equals $ 7,685.
The interesting part is that the max crashpoint is almost unlimited. I have seen a couple of crashs above 1 million.