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I am looking at LoyceV quote from your OP. He seems to suggest that people should follow the links to get to the original source where the content came from. Personally, I don't think that's necessary. If I used this thread of yours as a source for something I am writing, I need to give credit to you by mentioning your thread as the source of some of the info I got. I shouldn't have to research what you used. It's your task to point to your sources if you used some to write a particular thread.
I do not agree. In this case, you can add any link that has nothing to do with the text at all. And this once again exposes the user to a ban. It's just that everything is elementary, if someone copies from somewhere, it shouldn't be a problem for him to copy and paste the source into his text, especially since it is nearby
Apparently because the link to the archive is not proof and the moderator needs a post on the forum. If he looks at the current post and everything is fixed there, there is no reason for a ban.
I hardly post these posts at all. Why do you need this bewilderment when making a decision by a moderator? If you want the user to be punished by a ban, do not inform him. When you find a report, just click the Report button and wait for the moderator's decision. If the moderator did not react, then you can tell the community about it. And so, in fact, this topic is a good warning for violators to have time to correct their mistakes. Deprive them of this opportunity, and just do not publish material about them before the ban.

This is where I saw the problem. Seeing the time when the plagiarism complaint appeared, and the further editing time, is not a problem for moderators.
Therefore, I conclude that it is considered acceptable for the administration to add sources.
And also, by sending some points directly to the moderators, you don't have to wait for the user's ban at all, provided that the text has been well edited and changed. Everything that I send to the moderators in the plagiarism topic is processed in the best possible way.