That's a fair point. But the fact is that people do tend to set them up as hierarchies. But maybe you're right that most people don't understand that, given ho

That's a fair point. But the fact is that people do tend to set them up as hierarchies. But maybe you're right that most people don't understand that, given how adversaries exploit stuff like "games.apple.com.foobar.hosting.tw". You wouldn't fall for that if you understood the system.