Is internet a proper noun

The noun internet (Internet) can be considered a common or a proper noun.

Many people use the noun Internet as a proper noun because it the name of a communications system of which there is currently only one.

Others consider the noun internet a common noun because it is a generic term for many types of communication and interaction functioning through many types of devices.

Note: When the first transcontinental telephone cable was laid in 1914, it was a common noun even when it was the only one. Perhaps a hundred years from now, a system like the internet (Internet) will be obsolete.