There are several versions of sites that don't exist. There's URLs, such as the .mlp TLD that won't resolve, so any such URL written probably was written as some variant of a joke, from fan-fiction where sciTwi types in Griffinstone.MLP into her browser, to trolls who refer callers-out to https suckmyseveninches com; There's your nazi club URL, which used to exist, but no longer have control of their DNS entry, so some real-estate agency has put up a for-sale sign where a robust bazaar once sat; I posit too, that robust bazaars, mead halls, etc that have no DNS entry but are fully accessible by raw IP, also don't exist in an actchually... sort of way.
I'm less sure about functioning informational pages that aren't locatable but work the way they're expected to. .onion sites that only exist on the TOR network, and there are some blockchain equivalents, and our archivist here's love of ipfs, which requires you have a working hash of the repository you want to see, and I'm assuming unlike hyper-text, you can't, and aren't expected to be able to, find sites by reviewing the sights and following links -- someone has to post direct, not-misspelled hashes to a hypertext form, such as their TOR page - or on usenet, which still exists in the technical sense, just as gopher does.
Heh; that's what I should do -- make a 'blog site in gopherspace, and spam links to it around the 'net -- and keep track of statistics on how many out there install a client just to see if my rambling is any good.
(bleh. You know if I was sharing CP they'd all do it. Why not for pony pr0n? Oh, right...that's not illegal. To misapply the Han Solo quote, "Well, that's the real trick, isn't it?")
