Yes, of course. But does that mean that they have to give themselves a "a nonexclusive, worldwide, royalty-free and fully-paid, transferable and sublicensable,

Yes, of course. But does that mean that they have to give themselves a "a nonexclusive, worldwide, royalty-free and fully-paid, transferable and sublicensable, perpetual, and irrevocable license to copy, store and use your User Content"?