It was used on the ukpolitics subreddit for a while. What it lead to was that when a user made a perfectly valid statement that they wholly believed, but one which happened to be unpopular, the mob would cry 'bad faith' because they just couldn't accept anyone could make such a comment in earnest, and they were so offended by it they thought they were being trolled. Because the mob were the majority they just report bombed anyone with a minority view for bad faith posting, and the mods wanting a quiet life just banned the single poster to placate them. It killed the debate. They rolled back on the rule eventually.