Not OP, but I heavily rely on Google Maps reviews. Haven’t found another platform that replaces them.

I assume it’s region specific. There used to be alternatives in my area, but they’ve all died, and even with all the fake Google reviews, it’s the only way to get an idea about restaurants.

No, Google Maps is miles ahead of all competitors.

In what ways when compared to OSM?

Here is your comment should you wish to copy it and try again: I never run into a business that doesn't exist on Google Maps and I rarely run into incorrect hours. I constantly can't find businesses that I'm looking for on OSM and they never have correct hours.

I use OSM for many directions, after looking it up in Google Maps and copying the plus code because it doesn't come up in OSM reliably.

User content. Businesses update their info on Google Maps, users upload reviews and photos.

Just to add a different voice: I prefer OSM and for me it would be great.

In my opinion, no it's too shit compared to Google Maps, Apple Maps is also not great. Kagi have their own maps, which it seems is based on Apple Maps. Apple has no information outside the US (heard its better in the US but I just know it's not great in Europe or Africa). Things like operating hours.

FWIW I found Google Maps to be terrible on that front in Japan. Posted operating hours seemed to have no particular relation to whether a restaurant would actually be open or not.