Fantastic all-in-one resource!

It's technically incorrect in that IANA would like you to have your DNS server use the DNS protocol's built in system of record querying and expiry rather than pull a static file at your own interval (IIRC I don't think root servers support AXFR for performance reasons?) as there is no predefined fixed schedule for root zone updates. Practically, root zone update changes are absolutely glacial and minuscule (the "real" root servers only get 1-2 updates per day anyways) so pulling the file once per day is effectively good enough to never care it's not as DNS would intend you to get the record updates.

Setting this up in bind should be no more difficult than adding a `zone "."` entry pointing to this file, the named.conf need not be more than ~a dozen lines long. It's easy to make bind config complicated though (much like this article), but I'm not sure that was the barrier vs just being comfortable enough about DNS to be aware the endeavour is even something one could seek to do - let alone set out to.

The general root servers generally don't support AXFR, but if you want to AXFR the root, you can do so from lax.xfr.dns.icann.org or iad.xfr.dns.icann.org.