I’ve also wondered this. I’d also like to contribute info on how busy places generally are around me, so you know to show up early if you want a table, or don’t bother dining in on a weekend, etc.
Apparently MapComplete integrated mangrove.reviews, and you can upload pictures from MapComplete, so that may be the best option for now?
There’s also https://lib.reviews/ which is Creative Commons licensed. Looks like there’s open issues to integrate that into OSM via a plugin: https://github.com/eloquence/lib.reviews/issues/319
Sounds like you can follow these publishers on mastodon via their @flipboard domain.