This is by no means plagiarism if you refer to a user JollyGood, this is just his way to fight against scams on this forum. Some other user/s had a similar opinion as you, but mods do not agree with such an opinion. I personally don't consider it plagiarism, although some may find it irritating to see this way of posting. However, there is a big difference in what you did and what this user does, read more at the following link :

Mods requesting ban for jollyGood