This is practically useless information. I don't mean that in the "nearly useless" slang sense, I mean a literal "this information becomes irrelevant once you look at practically applying it" sense. E.g.:

- Centralized authorities for IP & DNS assignment? You (+anyone else you can convince) can just ignore that and it'll work in your bubble anyways!

- No centralized authorities for IP & DNS assignment? You (+anyone else you can convince) can just ignore that and it'll work in your bubble anyways!

My above pedantry aside, the article is explicitly about "The Internet" (still using the capital "I" oft forgotten about these days). I.e. the worldwide bubble which has centrally controlled assignment via ICANN/IANA, separate from other systems using the DNS or IP protocols. That's why it talks about ICANN and why bananamogul mentioned .self has not been centrally registered with IANA yet.