I have noticed that a large (increasing?) fraction of Astronomy SE answers appear to be relying very heavily on simply cutting and pasting material from other sites.
Where this is done without attribution - this is clearly plagiarism and is beyond the pale.
However I have noticed some inconsistent treatment recently of answers which quote huge chunks of material from other sites with essentially no further value added.
In one case, I see that a moderator deleted an answer because the material came from a copyrighted source. In another case, an answer flagged (for exactly the same reason) has been left left untouched?
I am also concerned about block quotation from sites like wikipedia. Whilst this breaks no copyright rules it hardly reflects well on the Astronomy SE as a place for learned discourse. I have seen one egregious example where a question was asked, that could easily have been answered by looking at wikipedia. The question was upvoted considerably(?); then the question's author answered his own question by block-quoting wikipedia, and then this answer was heavily upvoted too(???).
It doesn't look good and it doesn't happen on Physics SE (or not to the same extent). I think it should be outlawed.