Yes, non-paper based maps (= apps/websites) for hiking and cycling are almost all based on Openstreetmap.
Similar to the fact, that most servers, smartphones and all supercomputers use Linux. But gaming desktops not yet.
Google maps is more than just the infrastructure data, it is also reviews of shops, restaurants etc. There is not a single app/website using the OSM nodes/data as an anchor for reviews (as far is I know). http://HappyCow.net for example has its own database. It could have been made like http://wheelmap.org, which uses not only OSM but adds a layer on top of that for photos, which are saved in another database.