A while back I showed how you could drop data into a server log file, and jokingly called it CurlyTP. I have thought many times about embedding a website directly into DNS.
https://miscdotgeek.com/curlytp-every-web-server-is-a-dead-d...
Anybody up for the challenge? With some scripting you could do a dig on a TXT record, parse it, and display it right in a web page.