I still found such kind of game here, actually i found them often here now, although its not about bitcoin only but other crypto with faster confirmation. The issue on this kind of gambling is not the provably fair its the reputation of the website compare to those licensed one. I found them too suspicious and too risky actually.
There's a new thread -
https://bitcointalk.org/index.php?topic=5398548.0?I do agree that with on-chain, it is the reputation itself of the site matters.
And how easy it would be to ask for assistance if you got any problem.
It says from the thread, you can contact them 24/7, but can they really assist their players?