That is a very modern take on it. I think the cultures that matter are the ones that will protect you if you protect it. Traditionally they are very much based on ancestry or political power. Still today, when people run into trouble, the ones who pick them up are their oldest friends and relatives, not people from their professional or hobby subculture, even if they are big shots within those circles.
There are plenty of recorded cases of extraordinary acts of kindness between people who knew each other only via some online hobby subculture. It'd be nice to get some objective statistics here.
The problem is that traditional tribalism and nationalism lead to untold suffering through war, conquest, assimilation, extermination of other groups of people, etc. Pretend fighting in multiplayer games is probably the lesser evil.
