Other collective projects to try to archive Yahoo groups:

Queer Digital History Project: https://queerdigital.com/ygpresproject

Project to Archive Trans Yahoo Groups: https://archivetransyahoo.noblogs.org/list-of-known-trans-gr...

Project to Archive South Asian American yahoo groups: https://yahoogroups.southasianamerican.org/

I've got to guess that there are more.