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Signal and Threema want nothing to do with WhatsApp
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
Maybe eventually, it has to do with market share and if the service is a "core platform". Signal doesn't have enough market share to warrant it yet, even iMessage wasn't forced to since it's not that popular in EU. The law was mainly targeted at WhatsApp as that's THE messenger in the EU.