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.
Honestly if there was an alternate and functional phone/OS/app store that early adopters who are a little technical can embrace, it would be the #1 platform in under 5 years. People in the know are chomping at the bit to get away from these big monopolzed platforms, and once it gains steam and polish, people will flock to it.