One thing has changed. At some point, they introduced the 'shared management queue', and any random person can attach a subdomain to my domains, and apparently I have to explicitly deny these. Until then, scammers can create a subdomain on my domain, point it to whatever IP they want, and use it for their nefarious purposes.
I get that I'm a freeloader: I haven't paid for FreeDNS, so I can't complain much. But this seems like a terrible 'feature'. If I were a pro subscriber, my domains would be private and therefore not available for scammers to use. I've migrated all but one of my domains away from the service (they were all trivially easy - just haven't finished the last one).
Why doesn't everyone just use their IANA resolvers?
This service seems to offer hosting services, i.e. publishing your domain's records in the DNS in DNS authoritative servers.
A DNS resolution service looks up and maintains large caches of DNS data on your behalf, optimizing DNS lookups by not requiring your own device to recursively query many different DNS servers. These lookups start by querying the DNS root zone, which is published by the DNS's authoritative servers which are listed in the root hints file.