Semmelstulle

I always use the toll the website provides itself

Don’t forget you can self host it, preferably with Vaultwarden.

I can only repeat what I just commented somewhere else:

I built Swift apps and Mastodon or Discord are NOT a proper format to get help, Discord being crappy for archiving, too.

I have a hard time getting help by people that really know this stuff because Swift is made by Apple, and the Apple bubble tends to stick to Twitter and the likes. If enough migrate, I can finally say frick off, Reddit

Yes, ProtonMail is really good, I just missed the desktop bridge. It is a reality now but it’s not part of the free tier. I can’t really complain about them except for the icon design. They do not feel at home on iOS haha
I just have to confess I still use my outlook mail as my main because there is so much legacy stuff connected to it like Xbox games, Minecraft, two movies,… But I use Anon Addy to alias it most of the time. That’s why I can’t really give you a better impression about the Proton suite

Yeah Proton and linux gaming will only get better over time. Valve is heavily invested in getting this really good. And regarding the Android experience, I can only tell you that Google keeps trying to cripple the non Google experience even further. They just tried getting rid of Aurora Store and thus of getting Play Store apps without the Play Store. I just hope Aurora can keep operating just as it did until now.

LineageOS itself is just as private as AOSP and the Google core stack you might flash along it.
I have not found my source yet but once I’ve read about some Google telemetry within AOSP but that might be less than iOS on default settings sends. With Google core services you will definitely have more data collected on the Android side though.

EDIT: LONG POST, my opinion are backed on years of interest in the topics as well as first hand experience.

I’ll go Windows x Android first:
Windows is a privacy nightmare. You can try and fight it but you can and will break things along the way. So I’ll basically advise you to use anything else.
Android in the other hand has some options to flash custom ROMs and thus you can change what’s running. But you’re stuck with /e/ OS if you want real privacy without giving up on almost everything Google, banking apps, etc. There are other Android forks but most of them focus on security, features, gimmicks, etc. So at least there you have a good amount of control. You can use Android with KDE Connect for actually good cross device features in my personal opinion.

macOS iOS:
These are fully controlled by Apple. Sure, Apple goes hard against 3RD PARTY tracking, but does not tell you you need to switch off 1st party tracking within multiple settings pages (own experience). There have been some reports about macOS sending hashes of photos from a local account with no iCloud login, but that was fixed quickly, even though I’ve been skeptical. But this video by Techlore actually explains things really good.

MY conclusion?
I’d say the most private would be Android x Linux with KDE Connect.
2nd place is iOS with proper settings x Linux with KDE Connect. (For real, this tool gets you cool cross device sync.)
3rd place would be iOS x macOS both on privacy friendly settings if you, like me, rely on proprietary stuff. Xcode and iOS development can only be done on macOS and thus I’ll stick to this combo. Fedora will always have a special place in my heart and on my SSD though.
So which level of these you want to pick definitely come down to how much you rely on what software and what you can afford. I hope I could help.