They are either part of the "everything is a meme" bullshit, or they don't care whether the crap they're posting is a meme.
Both crowds will complain that they're not posting to other communities because they're "dead". Neither group sees the irony.
In the end, these idiots are looking for upvotes and have found the community of other idiots who will upvote anything in their feed without a care of where it's posted. This group of idiots can go back to reddit.