"You eat the cookie, the cookie is gone, but you transmit data over a network, the network is still there and can transmit data endlessly. Mediacom's assertion that the Internet is like a cookie you eat, is like saying copying a file on your computer somehow diminishes or degrades the original file, which of course is ridiculous."
While you're using the network to transmit data, someone else can not. The network has a finite bandwidth: by definition, it can only carry so much. If you're hogging it, someone else is limited.
Two houses are on fire. One home owner has a garden hose; the other has a fire hose. They're both drawing from the same hydrant. The amount of water available is basically unlimited; the water is unchanged no matter which hose it goes through
Why is that so hard to understand? Who do you want to be? The owner with the garden hose, or the owner with the fire hose?