The author makes up the restaurant story in order to ( ).

参考解析：

根据首段和尾段，以及第二段The Net's ability to profile you through your visits to and interactions at websites provides marketers with an enormous amount of data on you—some of which you may not want them to have可看出本文的主旨是讲：cookies and Alexa这类技术会窃取用户登录网站、消费记录等信息。而并未通过用户同意，也不尊重用户隐私，作者对此持批评的态度，故C项是作者讲述餐馆这段故事的理由，本题选C。而A项的"good services offered in some web restaurants"感情色彩跟作者的是相反的，排除；B项，作者讲故事的重点并不是谴责餐馆服务态度不好，故排除；D项"the incredible power ... to change your diet"也不是作者想讲这个故事的初衷，故排除。故本题正确答案选C。