>I once saw a city employee get off their riding lawn mower to move one of these signs out of their way, cut the grass, then get off the mower again to put the sign back!
Why wouldn't they? It's not their job to remove the sign and dispose of it. By leaving it in place, taking up space, eventually enough of these signs will pile up and cause such a problem that the powers-that-be will be forced to deal with the situation.
There is nothing to indicate that the comment was from China, where the is a separate power. In this case, the powers-that-be are the very same people who didn't do anything about it.
Why wouldn't they? It's not their job to remove the sign and dispose of it. By leaving it in place, taking up space, eventually enough of these signs will pile up and cause such a problem that the powers-that-be will be forced to deal with the situation.