Have you tried ‘microg 4 lineageos’? I’ve been using most of my bank apps without any issue through it even with strong integrity failing. Not ideal but it works best for me while minimising google’s existence in my life better than stock android. It even has OTA updates much longer term than my oem. A major caveat for almost all phones is the firmware can basically never be free, and sim networks are designed for spying anyway.




You might find your local state authority provides a lot of free/libre datasets for many things under some form of open data initiative. For currency conversion I’m not even sure you could claim proprietary rights to the underlying data. The APIs could be licensed but the underlying information is not really licensable. Currency conversion is so volatile that you will struggle to find user-sourced datasets in the same way as mapping is.