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U.S. officials urge Americans to use encrypted apps amid unprecedented cyberattack
(www.nbcnews.com)
This is a most excellent place for technology news and articles.
You think you are being the smart one here?
No, that's not what I said. Also cypherpunks and other hobbyists are not that much smarter than corporations and nation-states, to be the only ones to think about plausible deniability.
For example, the whole Windows sources have been given officially for various 3-letter agencies of various countries (Russia included) to study, and of course there are vulnerabilities with the size of such codebase. MS might not have left obvious backdoors and informed FSB of them, but it has given interested parties the ability to find those themselves, which is only a question of work, or maybe make tampered versions of DLLs and what not easier.
Also they are legally obligated to silently comply with a lot of things.
WhatsApp and Facebook (before it bought WhatsApp) have both done this, Telegram has done this, MS has done this, even Apple has done this.
You made that up, not me. Should have tried to read what you are being told first.