Why does Facebook's data center specialist argue that "The Internet is not a cloud?"

Why does Facebook's data center specialist argue that "The Internet is not a cloud?"

The cloud is an amorphous concept while the Internet is a physical network of servers and cables.

The cloud refers to software services while the Internet refers to infrastructure.

The Internet contains many individual clouds.

The cloud is accessible to everyone while parts of the Internet are private.

The Internet and the Cloud are better described as a series of data centers that can share data, connected by miles of fiber$-$optic cable.