But we don't have anything like FF as an alternative to go from Android. Especially considering banks require "certified OS".
> the banks/governments give the people devices to use for these things,
Give?The devices will cost "a reasonable amount" and have GPS tracking "for your safety".
Those devices have no network, no connectity, no gps, and no interface besides a tiny 7-segment lcd display and some 0-9 buttons for pincode entry.