I love the idea of this. I’ve struggled to get a setup like this to work on MacOS though. Which X server is the “right” one to use? Which is the easiest? Is there some way to make it work seamlessly with built in tools?
As an aside, instead of talking about growth hacking, and OSINT I think this whole thing could be a lot more relatable if the author chose a simple motivation like privacy. Another comment here mentioned subtools (?) which clearly highlights that not everything should be trusted with full access to your system.
It sounds like you missed the x11vnc part of this. You connect into the container using vnc, not x11, and potentially via a browser based vnc client. If you want to see a working example of a gui app running successfully in docker, check out https://github.com/jlesage/docker-handbrake
As an aside, instead of talking about growth hacking, and OSINT I think this whole thing could be a lot more relatable if the author chose a simple motivation like privacy. Another comment here mentioned subtools (?) which clearly highlights that not everything should be trusted with full access to your system.