I think the answer is both.
If you refer to an internet as a generic term, then it is a common noun and should not be capitalized. However, if you refer to The Internet, then you're using a proper noun and should be capitalized.
Along the same lines, there are cascades in virtually every mountain range throughout the world. But there is only one Cascades Mountain Range, which lies in the Pacific Northwest of the USA. When using cascades in the general sense, it would not be capitalized. When using Cascades to refer to that specific mountain range, then it should be capitalized.
Good Luck
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