The problem was that the engineers were building a scalable infrastructure rather than a scalable business. from the article: "The average volume of Fast custo

The problem was that the engineers were building a scalable infrastructure rather than a scalable business. from the article: "The average volume of Fast customers was low because most customers were from small businesses. And yet, every small business needed custom engineering work to be done, making integration slow. Several engineers mentioned how they did not understand how spending lots of engineering effort for each small client resulting in little revenue would result in building a company that could be worth $12B one day."