You already own any assets that you create by default. If you type a message into a text editor, you own the copyright on it. Under Facebook's Terms of Use, you more-or-less give up that ownership when you paste it into a form on their website. There is no intrinsic limitation in Web 2.0 technology that robs us of ownership, it is business incentives that do it.
Please explain how adding a crypto wallet or blockchain into this mix changes anything meaningful.