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Whatsapp is going to run terribly...
(www.androidcentral.com)
This is a most excellent place for technology news and articles.
I read an article about. Here is another one. Doesn't seem to mention any of the effects on Foss software so I might be out of the loop.
https://www.theverge.com/2022/3/24/22995431/european-union-digital-markets-act-imessage-whatsapp-interoperable