All it takes is adding one line into your DNS resolver's config and magic happens.
Not to mention that national domains are also not simply ruled by ICANN, these organisations are able to make independent decisions. And thanks to "Too big to fail" a lot can't just shut down by ICANN.
@Hyolobrika @sofia @rysiek @rune @jens Well, let's say ICANN would demand DENIC to get rid of example.de which DENIC refuses, what ICANN could do/try is to remove the entire de TLD from the root servers or put in some legal thingys at DENIC. But it's quite unlikely that ICANN would remove the whole .de TLD. Not only would this cause a gigantic outcry, it would break all trust in ICANN and also open up more legal thingys against ICANN. So basically TLDs are too big to fail.
@Hyolobrika @sofia @rysiek @rune @jens Talking about these independent rootservers, yes, they have to arrange with the other ones, but so far, that works quite well. Also you actually can force one or the other root servers for a TLD in the resolver config. So while they technically can clash, your resolver could still fix it.
That brings us to the blockchain example, which, as you said, due to everyone using just one, is actually more centralised than existing DNS? What was the goal again?
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