I have a solar array on my roof. If I find my house in OSM, there’s a lightning bolt icon indicating there’s a solar array present. Not only that, but the exact layout of the panels in my roof is shown. I never submitted this info to anyone, Google Maps Satellite view doesn’t show them. I’m really curious where OSM got such detailed data.
TIL. And, to confirm what someone else said in a now-deleted comment, a user used Bing aerial data to add it.