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From User talk:Stabby the Misanthrope
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To non-techies, "internet" already means the global internet. "Capitalize Internet if it's the global internet" is irrelevant pedantism of the highest order. Every business tech article I've read refers to a company's mini-internet as an "intranet," and home networking enthusiasts just call their mini-internet the "network" (e.g. "What's the password to your network?"). (And if you want to go into what non-techies call it: to millions of people, the "internet" is a disc and a plastic box given to them by their ISP. And when something goes wrong, the first thing they say is "the internet is down." I doubt they remember to capitalize it when appropriate.)
To most everyone, "internet" is a thing, not a title.