#BillGates promotes himself as a beneficial philanthropist these days, its key to remember that he was not a technical innovator. He innovated ruthless profiteering and marketing, selling his friend #BillKildall's innovation and cutting him out of the deal
See the history of CP/M for early details
https://web.archive.org/web/20120629044944/http://www.businessweek.com/magazine/content/04_43/b3905109_mz063.htm