many countries are not supported like South Africa, Uruguay, Paraguay, Latvia, Brunei etc. that is why degoogled OS support for banking apps are patchy and I don’t think normies are bother to install it.

if you mean this list that is quite concerning because each individual have difference banking preferences and it looks like it depends on the bank to support GrapheneOS directly But, I don’t think they bother because low market share (https://grapheneos.org/usage#banking-apps)

the thing about degoogled OS is lack of SafetyNet support and it is important for banking apps.

the thing about degoogled Android is SafetyNet Support. So, if you rely on digital banks then it is serious issue.