This is said very often, but doesn't seem to be working out in practice. Valve has spent a lot of time and money on machine learning models which analyze demo

This is said very often, but doesn't seem to be working out in practice. Valve has spent a lot of time and money on machine learning models which analyze demo files (all inputs). Yet Counter-Strike is still infested with cheaters. I guess we can speculate that it's just a faulty implementation, but clearly the problem isn't just "throw a ML model at the problem".