You’re not wrong, the map isn’t really the right place for that. Yet the map should provide a way to get from the physical location to more information about the place (physical building and logical business entity)

What’s the open equivalent of Yelp?

They don’t need to, since OpenStreetMap already exists.

They just need to do their part by contributing to it.

Technically the truth, but using a metal spatula will not have much impact.

There’s no [edit: manufactured, not easily replaced] coating on cast iron (unless enameled)