Did you review places via Google Maps in the past? @mangroveReviews@mas.to now offers a way to import your past reviews, which means they will also appear in CoMaps in future maps!
The reviews are of points in the OSM map, and they are published as open data with a permissive license so that they can used for anything. So it's not a project associated with OSM, but they work perfectly together nevertheless. That's the beauty of open data.