How much do I gain from switching to it instead of say, remaining on the Stock Android?
Edit: This looks comprehensive — https://staging.grapheneos.org/features
Beyond that, most of the other advantages will be less visible. They have hardened memory allocators that make various classes of security beaches significantly more difficult. There's a lot less superfluous background services eating resources. All that and more are listed on their website. It's well worth a read.
Remarkably, Nationwide (UK) runs perfectly even without Google services. (Except it doesn't poll for payment confirmations but that's understandable. They're always fetched when you open the app though. Or it could be my setup). It's actually quite shocking and it speaks to Nationwide as being a decent organisation.
It's also not necessarily a downside. Having your banking app on your phone can be a risk of you often take your phone out in public
The absolute blocker is Google Pay. That isn't supported
https://privsec.dev/posts/android/banking-applications-compa...
with its github backend
https://github.com/PrivSec-dev/banking-apps-compat-report
If you are in Europe, Curve recently enabled mobile payments without Google Pay, and that might solve the issue (but I haven't tried it myself).
Some app that don't work because they require strong integrity are listed here: https://grapheneos.org/articles/attestation-compatibility-gu...
This could be very useful. My Google skills came up short. Do you have a link?
From 2 years ago: https://www.reddit.com/r/GrapheneOS/comments/126nd51/comment... -> Sounds like Curve (without Google Pay) wasn't officially supported in Europe and didn't work for most people.
However, this seems to have changed a couple days ago:
https://www.reddit.com/r/curve/comments/17txz6u/comment/mkwl...
https://discuss.grapheneos.org/d/443-gpay-alternatives-for-g...
https://discuss.grapheneos.org/d/475-wallet-google-pay/105
https://discuss.privacyguides.net/t/curve-pay-available-as-a...
This is in line with an interview with the CEO of Curve from last month, https://paymentsconsulting.com/qa-with-shachar-bialick-at-cu...
> We are launching Curve Pay in beta for Android soon and plan to release it on iOS thereafter. This will allow customers to use Curve as their default wallet, just like Apple Pay or Google Pay.
…and with various German news sites reporting that Curve Pay is now available in Germany (and likely other parts of the EEA).