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Discord is laying off 17 percent of employees
(www.theverge.com)
This is a most excellent place for technology news and articles.
Does Matrix have video calls by now?
They are just using an implementation of Jitsi for the time being. Long story short: Yes, but they are still working on it.
Only if you use Element. Seems like the new Element client is making it even better, but afaik no protocol level support: https://element.io/blog/element-x-now-with-embedded-voip/