I mean, exactly how invasive are default operating systems? (Like Windows, Mac, Chrome OS, Android, iOS) Do they log your keystrokes, log passwords, capture screen, upload your photos, videos, or audio? (Assuming you aren’t a target of government) Is it even possible for the average person who doesn’t feel comfortable messing with installing operating systems to have any privacy?
You can definitely harden operating systems like Windows and Android to be better for privacy and security. I’ve used some of Techlore’s videos to make my Windows system a bit more secure and private, and he’s made one for Android and other OSes too. Of course, this isn’t perfect, but it’s something if you don’t want to install a different OS, it’s better than nothing.