[ajmurmann]

I started a similar project a few years ago and the real problem for any new player is just data availability. I was able to get Open Street Map data, but I also needed data on businesses with ratings and photos. IMO this creates a huge moat against anyone entering the market.

[yaomtc]

There is also Mapillary (now owned by Facebook unfortunately) and Yelp. I am not familiar with their APIs however.

[ajmurmann]

Not sure about Mapillary, but Yelp license agreement were to restrictive for me and I assume for most really interesting use cases