Update: A more active thread on how this relates to Goodmail and other attempts at sender-pays traffic
There is much talk these days of "who invented the internet?" Most of the talk is done wearing a network engineer's hat, defining the internet in terms of routing IP datatgrams, and TCP. Some relates to the end to end principle with a stupid network in the middle and smart endpoints. These two are valid and vital contributions, and recognition for those who built them is important.
But that's not what the public thinks of when it hears "the internet." They think of the collection of cool applications they use to interact with other people and distant computers. Web sites and mailing lists and newsgroups and filesharing and VoIP and downloading and chat and much more. Why did these spring into being in this way rather than on other networks?
I believe a large and necessary ingredient for "the internet" wasn't a technological invention at all, but a billing system. The internet is based on what I call the "internet cost contract." That contract says that each person pays for their own pipe to the center, and we don't account for the individual traffic.
"I pay for my half, you pay for yours."
While the end-to-end design allowed innovation and experimentation, the billing design really made it possible. In the early days of the internet, people dreamed up all sorts of bizarre applications, some serious, some entirely frivolous. They put them out there and people played with them and the most interesting thrived.
Many other networks had users paying not by the pipe, but based on traffic. In that world, had you decided to host a mailing list, or famously put a webcam up in front of your company fishtank, the next day the company beancounter would have called you into the office to ask why the company got a big bandwidth bill in order to show off the fishtank. The webcam -- or FTP site or mailing list -- would have been shut down immediately, and for perfectly valid reasons.
Pay-based-on-usage demands that applications be financially justifiable to live. Pay-per-pipe allowed mailing lists, ftp sites, usenet, archie, gopher and the web to explode.
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