Open Street Maps doesn't aggregate review data, only business info. That said, OSM doesn't really encourage automated changes for understandable reasons (vandalism, interest in human validation, etc). It's a tradeoff that makes OSM a lot better in my rural area, but maybe not in an urban area with a lot of business turnover

Yeah, talk about a chicken-egg problem.

If you want people to use OSM-based apps in place of Google/Apple maps you need to provide a way to access/add/edit (and better also import) POI reviews.

W/o them average users will not switch because offline navigationo via OSM is simply not good enough a reason. Particualrly if you have commercial (but free) stuff like HERE WeGo which does offline navigation better than any OSM-based app I've seen.

Agree, would be great with some kind of open POI service synced to OSM, and with reviews tacked on

FYI: You may want to check out Organic Maps, that is developed by the original Maps.me founders: https://organicmaps.app

There is Open Place Reviews: https://openplacereviews.org/. Also available as a plugin in OsmAnd: https://osmand.net/docs/user/plugins/openplacereviews

I saw 'Blockchain' on the top of that page and I closed the tab immediately.

Why does a review aggregator need a blockchain?

Also there is no way to import a review.json exported from Google Map via Takeout unless I'm blind.

Non-blockchain open review aggregator:https://mangrove.reviews/ still no import though.