Elon Musk's X replaced its DMs with Chat, which is end-to-end encrypted but not by default. Users must set up a private-public key pair when they first use the feature and X says it uses "a combination of strong cryptographic schemes to encrypt every single message, link, and reaction that are part of an encrypted conversation before they leave the sender’s device and remain encrypted while stored on X's infrastructure. Once messages are received by the recipient devices, they are decrypted so that they can be read by the user." It's not watertight though.
△ 乔忠良（中）调研工业场景，图片：采访人提供。体育直播对此有专业解读
。旺商聊官方下载对此有专业解读
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Илона Палей (Редактор отдела «Силовые структуры»)，推荐阅读51吃瓜获取更多信息