I once had work MDM on a Mac just... disappear one day. They definitely didn't intentionally remove it, nor did I do anything to remove it, but one day it just wasn't there. Maybe accidentally removed from the MDM management console for some reason?

Either way, everything still worked exactly as before, just now my Mac wasn't reporting back to the company at all. This went on for over a year until eventually I left the business, handed my laptop in physically and went on my way. I assume they noticed at that point, but before then they apparently had no idea.

I probably should have told someone, but since I hadn't done anything I didn't feel bad about it, and it was a lot easier to get stuff done without the corp stuff breaking everything