It doesn’t say that, only that they can’t make money off of said screenshots. That’s a sweeping legal rule, though.
Though strictly speaking, people take photos of zoos and parks that other people made, then make money off of them by selling to magazines and such.
Not entirely dissimilar, in the grand scheme of things.
Now, don’t get me wrong. I don’t actually care (sorry garry). But “just a picture” isn’t really accurate. If, say, Disney were to see an unlicensed image somewhere like that without any credit, they would likely take legal action for something that, ultimately, is just a picture.
I don’t think a big stink needs to be made out of it, but crediting on the internet or other media is actually nothing to just brush off.