When you choose to partner with and represent a brand, you enter into a contract with them that ties their PR with yours. It's your job to be a good representative. If you do something that would justify them dropping you, and the only reason you are not dropped is because they don't happen to notice you did it, then you still broke the contract - you just managed to dodge the consequences by luck and happenstance.
Maybe uwumarket doesn't give a damn what she says, in which case, that's fine; they're under no obligation to give a damn. The market will decide whether that turns out to be a profitable decision or not. But if they do give a damn, and this is something their contacts would take issue with her saying, then bringing it to their attention is not wrong. I consider this no different than warning a restaurant not to take job applications from a waitress I've overheard boasting about how she spits in customer's food.
Personally, I'd solve this by simply having every company give a very explicit set of public guidelines for its partners, so there is no ambiguity and no doubt involved as to whether or not something is worth reporting. Those guidelines will always exist in some form anyway, even if only as a vague set of moral principles in the CEO's head, so having them be clear and obvious is simply a public service. Unless you want to be Twitch or Youtube and purposefully obfuscate your CoC to keep your partners in constant fear of judgement. In a perfect world, no company would ever partner with someone whose conduct they disapproved of, but in the absence of a magical PR department that gives a damn and does its due diligence, public outcry is an acceptable substitute.
tl;dr; All that'll happening to Gumpai if she gets dropped is that she broke the contract she voluntarily entered into, and earned the consequences for it. In other words; don't shit where you eat.
