Pay securely with an Android smartphone, completely without Google services: This is the plan being developed by the newly founded industry consortium led by the German Volla Systeme GmbH. It is an open-source alternative to Google Play Integrity. This proprietary interface decides on Android smartphones with Google Play services whether banking, government, or wallet apps are allowed to run on a smartphone.
I prefer to take the risk of a compromised vendor over all the things google will 100% do with my payment data.
All power to you friend. Nevertheless it’s best to be informed, especially when attempting to make a better alternative.