[theamk]

From your link:

> The cheaters relied on a superuser account named “Auditmonster2,” that would observe tables and was able to see everyone player’s hole cards.

So.. the game was played exactly by the rules, and the full visibility would not have helped. After all, it was purely info exposure.

But you may say: in blockchain, we'd design special cryptosystem that will ensure other players do know know cards too early, as well as a verify that game is played according to the rules

My answer would be that if you have designed such a cryptosystem, you don't need blockchain anymore! Keep existing infrastructure, but apply encryption and verification at each client. After all, you do not care about world consensus for your poker game -- you just care about consensus between players. You will get all the advantages of centralized solution (high speed, very scaleable, low device requirements, easy upgrades), and server won't be able to rig the games.