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by mappu 4001 days ago
I'm interested too. My guesses:

- http://www.freenom.com/

- work-for/own a domain registrar

- own a pseudo-TLD like .com.me and are really just creating subdomains

- have a large account / custom pricing deals with a domain registrar such that despite a high total cost, the marginal per-domain cost is approximately $0

- only internally-routable domains e.g. /etc/hosts or company-internal DNS server

- only alternative DNS roots like Namecoin or tor's .onion domains