One of the reasons that these kinds of things aren't often enforced is that they are very hard to prove.
Companies are rarely stupid enough to openly say that you've been fired or given a low performance rating because of this specific act, but do something like this and you'll quickly find that you've got a non-specific "troublemaker/not a team player" reputation starting to be attached to you and once that happens, it's almost impossible to shake.
Companies are rarely stupid enough to openly say that you've been fired or given a low performance rating because of this specific act, but do something like this and you'll quickly find that you've got a non-specific "troublemaker/not a team player" reputation starting to be attached to you and once that happens, it's almost impossible to shake.