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Really? I thought it would be Nvidia! /s

I think the article kind of touch on it but just state in the lines of “to start a new country I get a list of big cities”.

You should reach to them and ask to add your city if interested:

The cities currently covered are 2937 - growing based on new countries and requests.

Pass thoses firewalls and other corporates proxy/VPN/… that block most ports. If what you build is at least partly used where user have internet access, you know this port is open. Even if 22, 8080 and all the others are closed.

Are you the one user of this OS Server side? /s