retr0.id/media/bd23a2fb-c7a6-4…
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Goose chase meme. In the first frame, the goose asks "all the data is encrypted?" In the second, the goose chases a person, asking "encrypted how and with whose keys, motherfucker?"
But we also can't check their process since they are closed source. Also, if they can decrypt in the browser or proprietary app, then they can still read your messages. Browser is vulnerable to other attacks.