Who even is Yahoo!?

Was this part of a message talking about the ending of life of yahoo groups.

I ask because some of the people I follow have been gnashing their teeth on this problem in a major way. In that the yahoo/verizon/oath/aol gestalt-megacorp has given virtually no time to archivists.

Yahoo groups often had the capacity to store files/documents too. There is a lot of digital content to archive, if it can happen in time. I know of supplemental content of atleast one RPG I need to look into for archiving.