Companies try to keep employees happy and committed, and part of that is making sure they see a potential future / growth for themselves. As a manager I try to both make sure this is based in reality and that employees are picking up the message.
I like to think I am good at this but it's a difficult skill, and external signal to "hey, you might want to check in with Bob a bit more carefully next time to make sure he's feeling as good as we think he is" could always be valuable.
So even from Bob's perspective it's positive - he may get the extra conversation that increases his options where he stays. On the flip side, what's the malicious use case? "You updated your linkedIn so I am going to fire you" doesn't sound like company policy that's going to be implemented anywhere because it makes no sense.