What you are describing happened when Asstr went down and Internet Archive decidied to not allow achriving of some adult material meant large swaths of fetish fiction disappeared.

Someone(s) did end up hosting an archived version of asstr they had but it did not include many of the subdomains(?) authors and groups had created and is missing a large amount of stories.

If some data hoarder out there has a full archive of asstr and you could throw up a torrent that would be great.