You are right. Although it comes down to the same thing. They are all just synonyms for contracts. ( a liscene is just a type of contract )

And this could very well be a good example of the 1% that would actually be uphold.

If they had your signature, that is. Getting exclusive content liscence without explicit permission? They cant even prove it was you that submitted the content in the first place.

Imagine a store having a sign that they own your bag, whenever you enter. Come on, this will not hold up in court.

Compare certain opensoure companies that require contributions to assign copyright to them. They all demand a real piece of paper, with a real signature.

When a user posts, they are representing that the content is theirs. If the real owner of the content posts somewhere else, that CL would have a claim against the fraudulent poster, not the actual creator. Either way, these contracts do hold up in court.