The post I linked to is just a fairly comprehensive example of a widely-known phenomenon. While some details in that post may be erroneous, the overall picture is not and has been independently arrived at by many different people. 9GAG reposts content from other sites. Fine. I'm not concerned about that. I'm concerned about the dishonesty with which they do it, and the claiming of others' content as their own. I don't even care that they use dummy accounts to make the community appear more involved than it is, after all that's how reddit started out, as well. I care that it's those dummy repost accounts that are responsible for some of the more egregious acts of plagiarism.

Lots of redditors will repost a picture and claim it as their own, but this is both frowned upon and the doing of users, not admins. 9GAG admins themselves are the ones guilty of plagiarism, and that's where they cross the line.