[jonnyone]

Those Yahoo Groups could be a trove of niche, otherwise uncollected information, especially with regard to vintage or specialty electronics. Removing them was a huge loss.

[kevin_thibedeau]

It's all on groups.io

[syntheticnature]

Group owners had to import; it was not all preserved.

There was some effort done with public groups by the ArchiveTeam, but I know they didn't get everything as there was no good way to find all groups.