What's your problem?
My problem is lawyers and their overly-broad statements. In this case, I don't care, I'm not submitting anything. But as long as this behavior is accepted, layers will keep putting stuff like this into licenses and contracts. And sometimes there is no real alternative, so you "agree", even if you really don't.
The whole point is for publicity, so they need to be able to use entries for that or there's no point.
So you submit your thing, and it is not yours anymore. Just like that. Surely, there is a way to allow conditional use without giving full IP rights.