Usually ATMs tell you if you are going to be charged but I agree it would be useful to have a map of free ATMs so you don’t waste time trying to find a free one, or end up paying just out of frustration/time constraints.
Secondly, I travel all over the world for my job and have encountered some ATMs that do not accept my Revolut card for one reason or another. It would be useful if somehow Revolut could also add a map with ATMs which definitely work with the card.