The decision for the OSM license switch was a questionable one. If you're in the US, the (federal) copyright statutes contain no sui generis provisions for databases. I.e., there is effectively on copyright protection for the kinds of things you'll be pulling from OSM, so long as you can guarantee that the data you're pulling is limited to the attributes that wouldn't meet the threshold for creativity. This includes all the boring but most useful stuff: coordinates, dimensions, building height, street layout.

This is not legal advice.