"Impossible to Cheat"

Let me tell you that there is cheating in cloud rendering solution ( Stadia, AWS Luna ect ... )

So 100% there is cheating in your solution.

It's trivial to read the screen.

You're right

Especially with today's computer vision

The cheating I'm more protected (just as stadia, etc..) is regarded to client/code exploitation

which we don't have to worry about in this approach