I've used a similar product at https://workfrom.co https://workfrom.co . Albeit, it appears they partially pivoted during the pandemic towards virtual co-work

I've used a similar product at https://workfrom.co https://workfrom.co . Albeit, it appears they partially pivoted during the pandemic towards virtual co-working. They have an app that has wifi speed reports which was my primary reason to install it (it also lists a qualitative score for accessing a power socket). There's around 20,000 locations in their database IIRC. The old web interface still exists eg: https://workfrom.co/search?g=seattle https://workfrom.co/search?g=seattle