I’m curious how many people actually think that, although it’s unknowable of course.
You’re right in that a huge portion of people would certainly make that assumption.
However, i would argue that the fediverse & open source in general is more “privacy respecting” because we can have a discussion about exactly what is disclosed and why it is disclosed.
In practice, using the web without leaking information about our preferences is pretty much impossible. “Privacy” (on and off the web) is never about “no disclosure”, it’s always about what needs to be disclosed, why it needs to be disclosed, and whether I personally am comfortable disclosing in exchange for whatever service I am seeking.