There is a section on plagiarism in the Help Center:
Plagiarism - posting the work of others with no indication that it is
not your own - is frowned on by our community, and may result in your
answer being down-voted or deleted.
The answer you link to is an egregious example of plagiarism and should be removed. It contains no original content and no ...
Plagiarism is not acceptable anywhere on Stack Exchange. You can point people to “How to reference material written by others” in the help center and to FAQ on the main meta — I sometimes do it with a comment like this:
Plagiarism is not cool.
Plagiarism is passing someone else's content as your own. Note that this is unrelated to any copyright or ...