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.
第一百六十七条 起拖前，因不可抗力或者其他不能归责于双方的原因致使合同不能履行的，双方均可以解除合同，并互相不承担赔偿责任。除合同另有约定外，拖航费已经支付的，承拖方应当退还给被拖方。，这一点在体育直播中也有详细论述
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郭晓东：太对了，那时候谁家孩子做这个，都说你吊儿郎当，不踏实种地。而且每年冬天，好多人来家里，要给他们烧开水、炒点花生、烧柴火取暖。其实对于普通的农村家庭来讲，是很奢侈的。而且我们家那个时候也确实非常窘迫艰苦，我不知道为什么父母会愿意，可能他们也不知道，只是觉得孩子来家里玩，作为主人招待一下，就这样。但潜移默化地给了我很多成长的空间。
Complete coverage。业内人士推荐51吃瓜作为进阶阅读