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On the blockchain and DNS
(lemmygrad.ml)
Talk about whatever, respecting the rules established by Lemmygrad. Failing to comply with the rules will grant you a few warnings, insisting on breaking them will grant you a beautiful shiny banwall.
A community for comrades to chat and talk about whatever doesn't fit other communities
The blockchain has to run on something, so even decentralized it would probably end up something paid. There might also end up a secondary market for domains, just like we have now, but worse.
Also, it most definitely does not cost $10 in compute, storage, or bandwidth to serve your one address. Besides, you basically never pay directly to the registry(the people that run the root and authoritative DNS servers), but instead buy from a registrar (a middleman). A lot of what you pay goes to the middleman, because they can usually get away with asking for it.
As oscardejarjayes has said, the $10 isn't for computer resources, it's mostly to pay the customer facing domain registrars and disincentivize squatting domains. Each subdomain (.com, .ca, .uk, etc) is controlled by some entity and for national domains part of the fee is a tax set by and collected for that nation.
In terms of the "compute" required for the DNS -- that's actually your internet service provider. ISPs synchronize and serve up DNS locally in order to give you faster internet (so users pay for DNS indirectly). You might have switched your domain to 8.8.8.8 (Google's DNS servers) which Google provides for free in order to try to speed up peoples internet access.