That's because, when you give something to someone else, it's not yours any more. This isn't rocket science. Same goes with copyright: if you give your creation away to someone else, it's not yours any more, it's theirs. The simple answer is to not give ownership away to someone if you want to put it in the public domain, or otherwise do something with it that this other party wouldn't agree to.

If you give your car away to someone else, why would you be mad that you can't just use it at random times?