If you really want control, what matters more is you having control of your own domain and encrypting what doesn't need to be public, such as backups and notes. Managing a self hosted system is often more expensive and more time consuming, and often those self hosted services store unencrypted versions of your data. But now you have to maintain the security of it yourself, usually worse than professional services, and your still one subpoena or hack away from it being exposed.

In the end you are still just as vulnerable getting booted off with VPSs like you are with google, but with domain control you can still switch hosts without losing your address, and you usually have customer support.