I think he meant that the name 'Internet' refers to a unique thing, the working global communication network connecting smaller networks of computers. The word

I think he meant that the name 'Internet' refers to a unique thing, the working global communication network connecting smaller networks of computers. The word 'internet', if it is to be accepted as a word with stable meaning in written language, should then not refer to the unique global network, but to something general, less unique, like the information service the 'Internet' is known to enable. If I saw the name 'Telephone system' with capital T in the middle of a sentence it would be curious, since such a name, in contrast to 'Internet' is extremely uncommon. Nevertheless, if the writer meant a unique system that has this name 'Telephone system', it would be correct to capitalize. However, when somebody asks me "call me on the telephone", they do not refer to unique global telephone system, they just refer to common service, like they would if they said "send it to me by mail" or "you can find it on the internet".