Doesn’t need to be suddenly. That said it isn’t as easy as you state. I’ve tried to get recourse and no one would even take my case because of made up bad reviews they’ve been keeping for years. At the place I used to work at the managers were not allowed to give everyone good reviews, 1/3 of the company got bad reviews every quarter. This is how corporations like cough capital one cough deal with this and get you out.