It isn't impossible nowadays to enumerate domain names using DNS data and score them based on the content they serve. Isn't that what we really want as users? Scoring based not on proxies for relevance like referral count, but on viewable content?

It's possible indeed as I'm doing it for another reason (monitoring sovereigty).

You can ask Icann [0] access to gTld domain list files (if you have a legitimate reason to do so). Once access you are granted access to a gTld, you can download a compressed csv file with a line per couple <domain, nameserver>.

[0] https://czds.icann.org/home