I have used Mattermost but iirc it has very limited access control unless you have the enterprise version and generally doesn't seem to be made for public groups.
This in addition to probably the main problem, it will have higher barrier to entry especially for those already using Discord for other purposes.
-Cynthia
On Tue, 2021-03-23 at 07:22 +0100, Cynthia Revström via NANOG wrote:
> Because Discord is proprietary, you can't host your own instance
For reasons of confidentiality we implemented a MatterMost server for
company use. It is free, works well, runs on our own servers. It lacks
some of the bells and whistles that Discord has (in particular it has
no audio or screensharing), but as an instant messaging platform for us
it's worked very well indeed.
Regards, K.
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