The OSM data that Apple are using is from 2 years ago. That would be under CC-BY-SA. Attribution is not 'nice', it is legally required (i.e. copyright infrigment if not attribute).
OSM is changing to ODbL soon (since CC doesn't make a lot of sense for this sort of data)
OSM is changing to ODbL soon (since CC doesn't make a lot of sense for this sort of data)