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I thought cheetah is only checking plagiarism not spam.

Well if you copy yourself that's plagiarism too and that should be noted! Spammers will copy/paste their spam for sure to save time.

I see where you are coming from but I can not share that notion.

Maybe first off because I am not a defendant of IP and Copyright, because I think ideas are free and dont belong to people.

Also for a counter example: There are footers many Steemians copy/paste under there post. That is not spam ;).

Sure and I agree but spam is something else.