I think every airline has these rules, detection, caring about it and enforcement are totally different events.

I had booked a 3 segment personal trip on points last month (a few months) which was eventually switch to a business trip and inadvertently forgot to cancel the point trip. It was refunded, no issues.

Because of WN's no same day standby and WGA to AT upcharge when changing point reservations, it wouldn't surprize me if people double book at times. I have when on personal travel...