By the way: I reported that post you found, with plagiarized images. No surprise, it's unhandled.
That's what I said:
mods probably won't be enforcing plagiarism rules on an image
There is probably a good reason for it, e.g. you don't want to start handing out bans for memes and twitter screenshots. It's just that sleezeballs will abuse it, like they're abusing self-mod feature.