I will share an unpopular opinion: thil will only make a freeworkforce for those projects who profit from using OSM. And the OSM has surprisingly unreliable data quality for walking around even in the popular tourist places like Tokyo or Kyoto, or New York. I've tried, and it's so worse than GMaps (or Bing) to being completely unusable. No work hours of Starbucks, no local dining cafe, no menu contributions.
It's great for the trail and hike outdiors, sure. But that's very different from the city map, as the nature featutes rarely change, not like city POIs.