It's called consensus. If HN in aggregate were a person, it would be somewhere slightly to the left of a right-wing libertarian. In practice the community also

It's called consensus. If HN in aggregate were a person, it would be somewhere slightly to the left of a right-wing libertarian. In practice the community also includes plenty of outliers like far-left anarchists and far-right nationalists. It's very much not an echo chamber. Not that "echo chamber" is a very useful criticism or notion given that it's so poorly defined and even when you can define it, you still need to demonstrate why the thing meeting your definition is bad.