I started writing "internet" in lowercase a couple of years ago. I have been teaching Computer Networks at a university for a long time, so I use the word quite a bit. It would be interesting to check my lecture slides to see if it is consistent there as these were developed during the time I changed from capitalized to lowercase. I don't have a change history, however. Never bothered to use version control for them.
Occasionally I still type "Internet". The last time I did, about half an hour ago, I quickly changed it lo the lowercase form.
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