It's one's own line and what you're looking to accomplish. Privacy can have a lot of different faces.

There's public/profile data, does a site demand full identity authentication to get an account, is that info public on your profile, is your comment/browsing/post history public or concealed? All those things still generally will reside with the service and be readily available if someone asks.

There's the privacy of data in flight, my ISP actually has it in their TOS that they reserve the right to collect browsing data and sell it to third parties after the FCC (US based) gutted what little network privacy/neutrality we had in the past administration, so since then virtually all outgoing traffic goes over a pair of VPNs just to avoid, or at least make more difficult being another data-point in the internet marketing machine.

There's the privacy of data at rest, can anyone on my own network or that comes into contact with my systems read things that they shouldn't be? File permissions or to the extreme end full disk encryption comes into play.

All personal preference and risk tolerances. Some are fine with putting all their personal info and that of their contacts in public hands, that's why places like Facebook exist to begin with. I'm pretty far on the other end of that spectrum.