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!
What we could do if an open source based gambling house starts scamming after years of maintaining reputation? I mean we do start trusting a new services only because of our known persons are not facing any problem with that services. I am not sure about most other people here but this is the simple way, I do start using any new services.
At the same time, no one could do anything about a business which turns scam at all of sudden. It should be treated as an accident as we could do nothing about that. Be warned anything and anyone may scam you at any time. Hence, just risk at your affordable level. No other way we have

.