Just read the thread on the previous occasion where listings got hijacked on their own fora [0] - its sad to see the sellers so powerless, helpless and just left to themselves.
You really have to wonder why they even bother...
Edit: also, reading that thread you can also get a feel why big brands have completely left AMZN as a platform (like Adidas, Birkenstock are a few i'm aware of).
Possible co-mingling of inventory, hijacked listings... no, just don't bother - of course not each and everyone is a heavyweight as my 2 examples - but do we really need 100s of dropshippers FBA'ing the same crap? I'd rather buy direct at the source than at Amazon these days.
[0] https://sellercentral.amazon.com/forums/t/review-manipulatio...