Privacy actually is binary, you’re either being watched or you are not being watched.
You may be watched by 100 different adversaries right now on windows or macos (regardless of how you configure your google chrome or safari), privacy is definitely not there for you
If you’re being watched by one adversary, privacy is also non-existant for you. All it takes is to tolerate the presence of a single closed-source software.
No, Privacy is when you have 0 adversaries watching you right now. The average joe out there may not like it but that’s how it is, there’s no sugarcoating this, you either have a FOSS host OS or you don’t, and obviously every app you use in that OS should be FOSS too.
Just say that any closed-source software you recommend is only suitable for public use and NOT private use, if you really want to be honest to your audience, it’s not complicated