I feel that people are not getting that is one of the larger issues with AI and pretty much everywhere people interact online.

Many of these places and projects were things we truly poured our energy into. But people change, just as operating systems and commandline executables do. At the same time, places like that, once they are gone, lose their weight... so any site that was really large or particularly represented a version of the zeitgeist of whatever subgroup, once it goes defunct, is kind of written out of any sort of AI historical lookup.

Also, there's so many answers on SO that a lot of people just use the Search function to find answers, if they choose to use SO instead of google or whatever. It is very useful for older and historical answers.