I suspect this would be easily gamed by careful experimenters.

For example, could you build a page that bots could navigate to, but would be really obscure for a person? Would that generate a substantial amount of clicks? Sure, the bots could adapt (i.e. not click on obscure pages), but that would take time to learn, and until then, they would screw up and fall into the honeypot.

If that has ever happened in the history of Google, you'd think someone would have publicized it.