Some crypto betting games are provably fair, while others aren't. When deciding the crypto games to play you should consider it's fairness. (Especially a game that requires luck.) Not all that claim to be provably fair are actually as they say, some are just managed by scammers.
A provably fair crypto betting game would have it's code on Github i.e. open-sourced. That way a developer can easily confirm the authenticity of the claims. Another way would be to use a provably fair tool to check. These tools can be found online.
A friend lost a chunk of his crypto investments to a scammer that claimed his game was provably fair. The owner of the website waited till the website was popular, to accrue more victims. Then he simply closed the website and vanished with thousands of dollars belong to people.
Don't play because others are winning!
That's another tactic the scammer used. He usually gave winnings to a circle of accounts that were managed by him. When you try to compare the losses of the accounts to wins, the wins would be more. He did this to entice his victims.
Be safe!
I would add to that that gambling in crypto sites is more dangerous than gambling in an ordinary casino.
When you bet with Bitcoin (for example) you make bets of 0,0001
BTC which seems like a small portion. However, in real money this is a decent amount. This makes gambles lose more money without noticing , so this is a risk that should be taken into consideration.
Crypto gambling is not dangerous but people Will have to remain careful while gambling with crypto ds it is anonymously spread all over the world. So just be careful while making gambling in crypto try to invest and use only well known sites and dont send online to any crypto website first search about their market reputation then no worries