A sideways look. The predominant business model for the internet is tracking users (for what is often called "advertising"). This is caused by the value of inte

A sideways look. The predominant business model for the internet is tracking users (for what is often called "advertising"). This is caused by the value of internet transactions being so very tiny, and there is no other way to charge that amount. But here is another business model. The "fee" is proof of work, as in the helping make the product better. Cool.