You’re missing the point. The good thing of being a designer is that I don’t need to worry about that kind of thing 
Kidding aside, when I say “transparent” I mean that we’ll let you search the most relevant sources for your particular situation (based on category, location and even amount) to give you the most relevant results at the top of the list. If we find problems mixing sources consistently will follow CityMapper’s approach… I hope we can make it better though 
Regarding the ATM finder… even though we’d love to remove cash completely of our minds (it’s difficult to categorise, etc.) I promise you that we’ll think about it. Thanks for the suggestion!