There are tons of mailing list mirrors around, and this is just another one. I can be a bit of a data hoarder, and for lists that interest me I like to keep a copy under my control in case the other resources dissapear at some point in the future.
A lot of the archives start in 2016, as that's when I got around to making the archiving a little more rational. If/when I get time, I'll try and go over the older data and get it sorted into a more sane format so that it can be added
Note that in February 2017, I started filtering certain types of mail out of the lists (the most affected being Cyberpunks) as the nature of some of the speech being made switched to topics I didn't want to provide a platform for.