That uses a workaround based on WiFi debugging even though it's all local. It doesn't run if you're not connected to a trusted WiFi network, you have to set it all up when connecting to a new network, etc.

Not only users are not connected to WiFi all the time, but in many developing countries people often have no WiFi at home and rely on mobile data instead. It's a solution, but not a solution for everyone or a solution that works all the time.