Whois++
en.wikipedia.org
en.wikipedia.org
RDAP has more legs to replace Whois than Whois++ did, but it solves a different set of problems: redirection, internationalisation, parseability, and consistency.
(I am an author of an RDAP draft, so probably biased.)
Their mail relays are unreliable though, it is much harder to make a site operator aware of an issue now :c
It was the early 90s. No one thought privacy was an issue. The internet only had nice people on it. Doxing wasn't really even a thing yet.
Plus, things like financial theft from individuals weren't really possible using online means only because no one had a bank account online. You still had to do that sort of thing in meatspace.