There's two types of "data under your control" at play here.
The first (and for most users, more important) is about not giving away your data to marketing companies. Switching to Fastmail accomplishes that (probably?).
The second is about securing your data from governments/state actors. That battle seems kind of futile to me. Even if I were running everything on my own server in my own basement, with my own ISP, I'm almost certainly not qualified to sysadmin a machine that needs to be secure against the NSA.
The first (and for most users, more important) is about not giving away your data to marketing companies. Switching to Fastmail accomplishes that (probably?).
The second is about securing your data from governments/state actors. That battle seems kind of futile to me. Even if I were running everything on my own server in my own basement, with my own ISP, I'm almost certainly not qualified to sysadmin a machine that needs to be secure against the NSA.