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 don’t use the phone that often as a debit /credit bank card but I use it for payments (bills invoices etc.), paying on line, transferring money to people and accounts, and just managing accounts. The phone app is very useful for those functions - especially if the alternative is going into a bank and queuing.
A phone OS that will not work with banking apps is not really a contemporary solution. iOS or Android are the only reliable options at the moment in the US/Europe - Iiuc Open Source Android has to sandbox Google Play for banking apps to work so that’s not viable long-term solution, as Google will only make that more difficult in the future.
Given the issues with the judges at ICC and US payment systems, building an alternative to Google and Apple is a high priority