A matrix instance has been setup for the domain discuss.online. This allows the user of usernames like @jgrim:discuss.online.
The consideration is to offer a matrix username and server access for each member of discuss.online.
This service is still in beta and heavily manual. If you wish to access the discuss.online matrix instance, please ping me directly. The automation of signing up will come soon; however, no release date has been set yet.
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Thanks! Going to check them out.