I could have sworn online gambling people fixed this years ago with just wifi. I thought I remembered reading a comment on here about the online gambling for kids no cheating people not talking to the online gambling for adults no cheating people.
They also have VM checks. I "accidentally" logged into MGM from a virtual machine. They put my account on hold and requested I write a "liability statement" stating I would delete all "location altering software" and not use it again. (Really!)
looking at cards is a way easier problem than rendering a 3d world with other players bouncing around. I imagine you could just send the card player basially a screenshot of what you want them to see and give them no other data to work with and that would mostly solve cheating.
But gambling can be way more complicated than just looking at cards so maybe there's a lot more to it.