I flagged this answer, which consists primarily of a large screenshot of a Wikipedia page, for moderator attention, and that flag was rejected as invalid.
I'd like to appeal this rejection, and get general site consensus that this is not a good practice.
There may be a case where, when the question is about some website that a small screenshot for illustrative purposes might be appropriate. Here, though, it really seems wrong. If the information is important to the answer, summarize it and link to the original. If it's not important, it doesn't need to be there. Either way, a big picture of text is not good.