Agreed. But why don't they all get banned instantly?
Because the forum don't want to lose more traffic, not all reports in plagiarism are taken action by moderators, only the posts are being deleted, while the users didn't get banned. So, this might be the reason why all users that use AI didn't get banned.
So each of the websites above should list all authors of each open source package they use or be banned?
There are no rules in this forum the developers will be banned for committing code plagiarism.
What I know there's a license to protect digital property, so the authors can sue them for breaching the license.