Side note, looks like that if installed by snap on Ubuntu 20.10 it cannot automagically change the proxy configuration in Gnome
green-tunnel:system-proxy [SYSTEM PROXY] error on SetProxy (Error: Command failed: gsettings set org.gnome.system.proxy mode manual
green-tunnel:system-proxy /bin/sh: 1: gsettings: not found
Enabling proxy manually makes it work but yet, it doesn't circumvent my ISP filtering :(