Noob Question: If you aren't willing to deal with custom OSes like Linux (for computers) and Android Custom Roms (for phones), do you just not have any privacy at all?
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?
We don't know if they do, but they certainly can. Especially if you are on x86. I'm sure Android (which comes from OEMs) and iOS devices spy on you.
No, you have no respite unless you switch to custom. The good part is that this process is much easier than before (especially on the desktop), and will keep getting easier. Graphene already has their Web installer when you plug your mobile into your computer and let it do its job. Installing Linux is the easiest it has ever been, and I would argue that this trend has creeped into even the more advanced distributions like Gentoo/Funtoo (their guide is extremely well written and easy to follow + forums).
The only thing you are losing is time. If you don't have the time, then no, you should stick with the easier ROMs/Distributions. I would never espouse using Windows/MacOS/OEM Android/iOS unless forced to by circumstance.
I mentioned Intel because ME is cancer embedded in hardware. Even if someone was good enough to rewrite windows code to remove all telemetry (in theory), there is nothing one can do about hardware.
AMD's OPENSIL might change that, but we'll have to wait and see. The fact is that ME can hijack one's system resources and push telemetry to Intel, including public IP. That's the worst offender in my opinion
AMD does the same thing with their PSP. But AMD is supposed to release OpenSIL in 2027 which should theoretically give the community the keys to stop PSP from booting and work Coreboot/Libreboot for other motherboards