Honeypots are used pretty often, sure. They're not enough, though useful.

Behavioral analysis is way harder in practice than it sounds, because most closet cheaters do not give enough signal to stand out, and the clusters are moving pretty fast. The way people play the game always changes. It's not the problem of metric selection as it might appear to an engineer, you need to watch the community dynamics. Currently only humans are able to do that.

If you play with friends and your cheats cooperate, I don't think honeypots would be fool-proof any longer. Unless you all get the same fake data.