Sounds like a big distraction.

Why are the green ones always angry?

I suppose you know this, but green means the account is new (https://news.ycombinator.com/newsfaq.html). Angry people sometimes create new accounts to vent. That's not a good use of HN, but let's not respond as if there's something wrong with new users coming to the community. We don't want this place to become insular and brackish. New users are the community's freshwater!

This is a great point. Do names turn from green to grey based on karma or time?

Time alone.

Anonymity can breed honesty, I guess.

They haven’t ripened yet.

Its not cause the License says nothing about training. I mean every oss dev's brain would be under GPL then.