[dredmorbius]

Even Redstone appropriated the phrase from elsewhere.

Though it’s often misattributed to Bill Gates, Sumner Redstone popularised the phrase “content is king” which was used in a 1974 book, and pre-dates even that. See: https://lgkmarketingcc.com/content-king-said-better/

The book seems to be J. W. Click, Russell N. Baird, Magazine Editing and Production. W. C. Brown Company, 1974, 274 pages. (https://www.worldcat.org/title/magazine-editing-and-producti... (Google Books preview: https://books.google.com/books?id=lMpHwLnvsvAC&q=%22content+...)

Earlier appearances in the 1960s refer to educational films (https://www.worldcat.org/title/toward-improved-learning-a-co...). (Google Books: https://books.google.com/books?id=LiQgAQAAMAAJ&q=%22content+...)