yes, funny in any case! I looked up the reference yesterday since the original post was ambiguous whether this was the “best bank app in the world” or the “app of the best bank in the world.” I found this:
and of course felt bad that custom ROM compatibility wasn’t on the list of metrics they looked at:
app functionality, user experience, and customer ratings
Apparently “app functionality” was not marked down if the app doesn’t run at all by default on more secure / private platforms. 
It makes sense from a general financial security perspective to start with apps that can run on less-surveilled devices and work backward from there… so thanks to @Jets for helping answer that question (which I’d asked for help with a few days ago here).