> Not that Apple Maps, like Google Maps, pulls in data volunteered by the OSM... then locks it away

You have that backwards, at least for some companies.

> How Facebook, Apple and Microsoft are contributing to OSM

At the State of the Map conference in Milan, the teams from Microsoft, Apple and Facebook presented their projects, describing how they are working with communities.

https://www.theodi.org/article/how-are-facebook-apple-and-mi...

I've never seen any cite for Google contributing their data to OSM.