I stumbled upon a user who seems to have been suspended for plagiarism:
What is plagiarism and why can it get an account suspended?
Plagiarism is the copying of content (text, images etc...) without attribution.
The user seems to have copied the contents of their answers from elsewhere without saying so.
Wikipedia says this:
Plagiarism is the "wrongful appropriation" and "purloining and publication" of another author's "language, thoughts, ideas, or expressions," and the representation of them as one's own original work.