maybe it's because those cases that you reported on this thread are cases from the past. do you have any recent complaints? because all I saw are things that happened in the past years and I don't see why someone would be leaving negative feedback because of something that happened 1 year or more years ago. My point is that people can change and we have to make judgments based on the present and not the past when we leave negative feedback and about why the manager accepts him to participate in the signature campaign I think the answer is quite simple:

each manager can accept anyone he wants, even if that person had a hundred alt accounts, a hundred negative feedbaks, the manager can still accept him.

The rules for each signature campaign were created by the managers, this means that they can change or simply ignore the rule and accept whoever they want