The only hierarchy that really exists and makes sense is the ccTLDs, but only some of them. .de, .cn, .fr, .uk, etc., these are mostly registered by people and

The only hierarchy that really exists and makes sense is the ccTLDs, but only some of them. .de, .cn, .fr, .uk, etc., these are mostly registered by people and businesses within the actual country and used within the country as well. But there's so many other ccTLDs like .us, .io, .ai, .ly, .me, .co, etc., where they're functionally just two-letter generic TLDs, and the hierarchy doesn't work for them.