How did you know how well these results work?
You mention the quality several times in the article but it's not clear how this is verified. Do you have a set of known-location-ip-addresses around the world (apart from your home)? Or are we just assuming that latency is a good indicator?
I run about 270 servers in verified locations as part of the Globalping network https://globalping.io/users/jimaek so I had plenty of targets to test
I tested against them, as well as other infrastructure I control that is not part of the network, and compared to the ipinfo results as well