Much of what's been posted to is not in the public domain. And anything that gets pasted into Wikipedia often gets repeated like wildfire with the assumption that Wikipedia contents have also been, give or take, donated for anyone to use. Of course there's very little prevent anyone from pasting copyrighted text in there, at least until someone else bothers to do the very human work of identifying and removing it.

(Aside: Does Wikipedia spider through its contents searching for known copyrighted work?)

The exploitation of open use hosting sites seems to be a place where [very] petty [marginal] criminals [unwittingly at times?] are laundering copyrighted work.

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