Comment by NoGravitas

I use GrapheneOS, but it doesn't solve this class of problem. If your {banking|taxi|cash} app doesn't pass Play Integrity API running under GrapheneOS, you are out of luck for those apps. There are different levels of Play Integrity pass, and GrapheneOS does not pass the highest level of them, so some apps may work, and others not. I don't want to use Google Pay, but I couldn't if I wanted to on GrapheneOS, and I've seen people in this thread saying that where they live it can be difficult to pay for something any other way.