&#x27;Someone once asked Slick Willie Sutton, the bank robber, why he robbed banks.<p>Sutton looked a little surprised, as if he had been asked “Why does a smoker light a cigarette?”<p>“I rob banks because that’s where the money is,” he said, obviously meaning “in the most compact form.”&#x27;<p>Why do you develop against a proprietary API? Because that&#x27;s where the users are.