I think proton has two levels of ‘killswitch’ on it’s VPN. The regular one is more of a ‘killswitch but only when you have the app open’ while the extra options are supposed to make it an actual kill switch. Whether or not this second level is completely effective I can’t say.

Binding your client to the vpn interface is definitely the way to go. This safety measure is widely known, but I feel that it is much less well known than it should be.

Do you typically teach Godot with C# or with their own scripting?