Plagiarism can be a bit of a grey area and I tend to frown on people who feel they have "intellectual property rights" over language or ideas . Its a slippery slope as well . I think some people are quick to attack anyone they disagree with flagging or hate speech and abusing any system intended to protect or provide justice. There will always be clever assholes to abuse any such system. I think we are better served by just leaving free speech alone. You don't have to agree but you have no right to silence anyone.