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WhatsApp is working on video and voice calls on the web
(www.theverge.com)
This is a most excellent place for technology news and articles.
Matrix is slowly getting there.
They need to combat the insane spam problem before they can truly take off.
In the past 5 years of using Matrix, I have received exactly 2 direct spam messages, and seen maybe 5-10 in public rooms. (There have been none in my private chats, of course.) If you're seeing much more, I guess it must depend on how you use it and what rooms you join.