I think that there is no other electronic cash system in which your account isn’t owned by someone else. Take PayPal, for example: if the company decides for some reason that your account has been misused, it has the power to freeze all of the assets held in the account, without consulting you. It is then up to you to jump through whatever hoops are necessary to get it cleared, so that you can access your funds. With cryptocurrency, you own the private key and the corresponding public key that makes up your cryptpcurrency address. No one can take that away from you (unless you lose it yourself, or host it with a web-based wallet service that loses it for you). I also think there are other advantages to share together.