True, but that’s because the Google ecosystem is much more than Geo data. I agree typing that into OSM search won’t have any effect, but with OSMand for example I can filter search results for glutenfree and it works (if the restaurants have that specific key). Less comfortable, but not impossible. Much more ‘problematic’ IMO is OSM missing the possibility to rate places and add photos of meals and menus.
The oldest residential building is from 1550, but there is a church where the oldest parts are from the 11th Century.