Why Does One Coworker Always Snitch to the Manager?
Humans are hardwired to trade information for status, it's basically social currency. Coworkers snitch because of: 1) ingratiation, they're buying favor with whoever holds power 2) in-group signaling, distancing themselves from the crew to look like management material 3) preemptive scapegoating, get the blame on someone else before it lands on them. Keep them in your business, keep your business boring.
What's actually happening
New job, one person is always watching
Small stuff gets reported for brownie points
Break room turns into a surveillance state
Give them nothing worth repeating upstairs
The snitch's real payoff
Nobody knows if the tattler even realizes management sees right through it too.