I doubt what I saw will really add to what Doctor_Fegg says in his talk. However, a few examples:
https://daylightmap.org is built by Meta (Facebook) to allow their maps to meet their quality needs consistently while still pulling and encouraging OSM updates. This unlocks OSM data for a large amount of sensitive corporations.
I personally have made quite a few edits on behalf of customers who pointed out errors in the map.
The popularity of OSM-based navigation apps has made it useful for people to download editing apps to ensure their locale is as up-to-date as possible (this is getting better and better every year).