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Decentralized Matrix messaging network says it now has 115M users
(www.bleepingcomputer.com)
This is a most excellent place for technology news and articles.
I have been running my own server for a few years now. I would describe it more as an alternative for What's App or Signal than an alternative to discord. I think it's more used in a professional/and or government setting for organisations who need to run their own services.
Also, Matrix is just the protocol behind it and there are quite a few different clients for it, the most popular one is element. Lemmy.world also has a link to their Matrix instance.