Yes, it’s very interesting although the networking stuff is not very fun.

Why do you think that a VPN isn’t viable?

I don’t understand it, why doesn’t these commands block internet access when they block DNS traffic like the ufw command?

I already have considered this. Generally I prefer a dedicated IP over a shared IP, especially since I consider the use of private trackers. There are some use cases though like high OpSec operations or a higher privacy need were a shared IP is beneficial, but for me this is not needed.