好像 signal app 在国内一直可用。挺奇怪，用过很多边边角角的聊天工具被封的是多数。signal 也不能算很冷门了，推出已经多年而且相关中文报道和讨论也不少，是因为用户太少未引起重视还是被掌握了监控方法而一直故意放行？
@super反正不匿名，将来拉清单不过要真拉了，我就去喝茶了
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