问HN：你认为最优秀的非自用软件是什么？
似乎每一款“伟大”的软件，比如苹果和微软的操作系统、谷歌的搜索引擎、亚马逊的AWS、脸书等，都是经过内部测试的。那么，这条规则最大的例外是什么呢？
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It seems like every "great" piece of software, e.g. the operating systems of Apple and Microsoft, the search engine of Google, AWS inside Amazon, Facebook etc was dogfooded.<p>What's the biggest exception to this rule?