I actually don't see anywhere on the Nominatim website that restricts commercial usage contrary to the article's comparison chart,
Likely refers to using the OSM maintained servers "be aware that the service runs on donated servers and has a very limited capacity" https://operations.osmfoundation.org/policies/nominatim/
Likely refers to using the OSM maintained servers "be aware that the service runs on donated servers and has a very limited capacity" https://operations.osmfoundation.org/policies/nominatim/