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.
I played before on gambling site that is like that I think it was TRX network related gambling site, I am not sure but I think the game is rigged as I have played the dice game with 80% chance of winning but lose 8-9 streak consecutively. Although it is possible but I think something is not right on the site, or I am just unlucky. I forgot the name of the site.
The benefit of on chain gambling game is about its fairness as it should be able to be verified easily.
You cant judge a game is rigged just because you have losing streak in the game, as it happen really often in provably fair games of reputable casinos.
When it comes to on chain gambling, site's names that comes to my mind is directbet with its sports betting and luckybit with its plinko game.
They were the best on chain gambling site years back but unfortunately they stopped the services.