Some banks and ATMs have the Dark Arts landmark, which means that more of that particular trace appear near them. This appears to be based on OSM tags, and is unrelated to POI submissions.
Will banks be special locations in Wizards Unite? Presumably yes, as the official First look post states that certain Foundables will appear more frequently near them. We’re not sure if you will be able to submit new banks via OPR or will Niantic reach out to bank conglomerates and preload a list of locations to the game. Traditionally, banks were not considered valid POI candidates, but given the Harry Potter lore (Gringots) it is possible that this will change.