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Meta has discontinued its metaverse for work, too
(www.theverge.com)
This is a most excellent place for technology news and articles.
I mean, SL took off enough that it's still here. A lot of F2P MMOs from around then aren't really around anymore at all, I can only think of 2 others.
It may not be one of the big MMOs, but an estimated 600k MAU isn't anything to sneeze at either.