I evaluated OSM for an AR real-world strategy game (like pokemon go) I was building years ago (terramango.com), as implementing it would have saved hundreds of thousands of dollars. Problem with it in the US is that so many places don't have parcel boundaries, and if they do, they are often pretty far off from reality. We ended up using Google Maps (cost wasn't an issue yet because we were only in a private beta stage) and negotiated a limited free trial for parcel data from a private supplier. The private supplier scrapes county records (some of which are only available in person, and other countries charge a fee for access) and their records almost always lined up with Google's parcel boundaries, OSM did not.
Other countries I randomly spot checked did seem to have great OSM records though.
Pokemon Go doesn't need individual parcel data the way we did. They only needed a few points of interest (lat, lng), whereas we needed geometry data for every parcel with a building on it.
Other countries I randomly spot checked did seem to have great OSM records though.