@TeamYouTube I've got a list of youtubers who have expienced the same issue as me being demonetized with the same 'duplication' issue on their accounts. Most of which are in perfect standing with community and copyright guidelines. I will update this thread with these users.
I wish they'd have said something like Due to article 13, please check that any original copyright videos (meaning the ones where it says, revenue goes to the artist, you don't need to do anything) that were once ok are now not
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That’s what the old system do, owner claims the revenue, it’s fair, but at least tell us which video got problem

Thanks. Twitter will use this to make your timeline better. UndoUndo
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