is it possible you pull this off but for Chinese, European or GCC market?
I feel there is complete gold mine out of the US which people might be ignoring.
It works for any country with Google Maps, so China won't work but besides that, you can get the data in many countries. Some countries are not that active in reviews in Google so data might be more limited, but I've done similar stuff in the past for Mexico and Brazil and it worked great.