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It is not ad-hominem, he is using proof from a different source than the original article to show that the author is just flat wrong about services like Github providing no value. In this case, the minimum amount of value Github was adding was the cost of however much time it took the article to mess around with Nginx and then write his Go script. Multiplied across the entire population of people using Git (keeping in mind that many of them probably aren't capable of solving the gitweb problem), that is already a sizable value-add.

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