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?
Mac is less intrusive than Windows. Windows 10 is a whole lot less intrusive than Windows 11. You can lock Windows 10 down even more if you use Shut Up 10. It’s an amazing piece of freeware. Just be aware that Windows will reset a lot of your options after major updates.
Duck Duck Go is more secure than any other search engine and browser. Firefox is next in the list if you’re not on a Mac. Get uBlock Origin and NextDNS.io.
Don’t give your real information to companies when possible. Don’t browse the web logged into Google, Facebook, Reddit, TikTok, etc.
I would say there’s an argument to be made against duckduckgo with how they’re not open source, and the whole allowing Microsoft trackers deal, but it is definitely a better option than google or bing. I don’t understand why you’re mentioning their browser however, as there are definitely much better alternatives.