I think it's a move to prevent staff parking in certain area which mainly reserved for customers, they should already gave instructions for staff where to park for long hours, places like 1u, they want to prevent staff utilizing their internal parking and want staff park far away.

It's a move to allow customer to get parking, and they seems pretty sure those parked more than 4 hours aren't their customers and abusing of the cheap parking which was mainly targeting potential customers.

Sue them for drawing on your car?