Started with Ubuntu at 12. Did a LAN boot to my mom’s laptop somehow, I couldn’t explain it if I tried. It was supposed to be on my PC. Didn’t work in the end and got grounded for “hacking” went back to it though a few years later at 16 and dived around Ubuntu and Gentoo. Never installed gentoo but I certainly kept trying.

Not outright stated. Closest I could tell on a skim of their site is third party blocked by default

Most of my workforce strangely enough. They claim it’s the best for them in terms of mathematics, but I can’t find that to be a good reason.