Is the internet a public good?

Answer 1

It is does not meet the strict requirements to be classified as a public good, but it has very large positive externalities.
The Internet is like the road system. Extra users do not effect the use by other people most of the time, but can when traffic is heavy, Users can not be excluded from access, but they need an initial lump sum investment (car-computer), Some sites can and do charge for use, just as there are toll roads as part of the road system.

Answer 2

depending on the type of public

Answer 3

It depends how it is used.