[dmitriid]

Nope, it wasn't.

ArpaNet wasn't an internet until at least 1983 when the military network was split off, and commercialisation began.

10 years after that we already had Tim Berners Lee inventing www in a lab that was connected to a global communications network and routinely used by hundreds of thousands of people.

Prior to that, for example, France had Minitel which already had distributed services, email, payments, orders and so on: https://en.wikipedia.org/wiki/Minitel