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I personally use both, Proton for almost everything (with Proton Ultimate and Simplelogin aliases) and Tuta (still on the 1€/month plan) for few things where I need notifications without google play services.

Disabling secure app spawning for that app might help, at least it does with other apps banning GOS as a rooted device like comdirect photo tan app

Musty you can delete the youtube app and watch in browser if you're sent a link or want to watch a video. you can keep up with subscriptions via rss reader.

jocelino I can only speak for mi band 9, but it does show HR in realtime while working out, so it should work on an mi band 8, too.

lovefromisrael There is really no privacy/security benefit from this, so it's unlikely that it is getting implemented, but you could check if there is an existing request for this on github.

Don't give it the location permission

With sandboxed google play services installed, the app compatibility should be nearly on par with stock Pixel OS, except some Banking apps and a few other apps enforcing strong play integrity. Many apps will also run fine completely without Play Services, but YMMV.

The apps you install, for example Instagram and Spotify, can still track you through their algorithm, the files you upload or give them acces to, IP address (unless used with VPN or TOR), etc., but thanks to features like storage scopes and contact scopes you can better limit what files and contacts on your device the app has access to. Also through the extensive security hardening the GrapheneOS devs implemented, you will benefit from running such apps on a GrapheneOS device no matter what.

Regarding android auto I can't speak from first hand experience since I never used it, but as far as I'm aware it should mostly work with sandboxed google play services (with the exception of few cars that use a non-standard implementation I think. You'll likely find better answers to this by searching for "android auto" on this forum).

classic_computer_669 Never used apple reminders, so I don't know if it is a good replacement, but I use tasks.org for todo lists/task management

smash0573 if you disable the apps instead of deleting them, they will get updated

Ingonimania AFAIK Seedvault can't directly backup to Proton Drive but you can backup to your internal storage and then copy the .SeedVaultAndroidBackup Folder(or whatever it's called) to Proton Drive

feliik the default backup in the settings is SeedVault

DeletedUser93 Charging only while locked doesn't mean that the phone will only charge when it's locked, but that only charging (and not file transfer etc.) via USB-C is available when locked.

bobsandvagene You can install Snapchat in an extra profile. When you want/need a new Android ID you'll have to delete the profile, create a new one and install snapchat there.

bobsandvagene Snapchat works on GrapheneOS (at least with Sandboxed Play Services, don't know if it works without). Your IP will not be hidden by default but you can anchieve this with a VPN or Orbot.
If you get banned and try to create a new account Snapchat can know that it is still the same installation as per GOS documentation

Apps can generate their own 128-bit or larger random value and use that as an identifier for the app installation. Apps can create data in their app-specific external storage directory by default without needing permission, and in the legacy storage model before API 29 that data persists after the app is uninstalled, so it can be used to store an ID that persists through the app being uninstalled and reinstalled. However, external storage is under control of the user and the user can delete this data at any time, including after uninstalling the app. In the modern storage model, this data is automatically removed when the app is uninstalled. GrapheneOS includes Seedvault as an OS backup service which must be explicitly enabled, and it has the option to automatically restore app data when an app is reinstalled, so it wouldn't lose track of it being the same profile.
The ANDROID_ID string is a 64-bit random number, unique to each combination of profile and app signing key. The 64-bit limitation means it isn't particularly useful due to the possibility of collisions. It's tied to the lifetime of profiles and does not persist through profile deletion or a factory reset. This is comparable to an app targeting the legacy storage model storing a 64-bit random value in the app-specific external storage directory. In the future, GrapheneOS will likely change this to be tied to the lifetime of app installations rather than profiles. An app could still track the identity of the profile through data you give it access to or via data another app chooses to share with them.

Is it possible to have a 6+ digit second factor PIN confirm automatically? I believe it's possible with a normal 6+ digit PIN, so is this functionality simply not implemented or can I just not find it?