By your definition game development (in the old style) is also passive income… so is art… so is building a house or a car or pretty much any form of manufacturing.
These activities all involve building something with no promise of selling it - then trying to find a buyer… in each case you, the producer, are investing up front in a venture which may or may not succeed and then hoping someone will pay you for it.
Removed by mod
By your definition game development (in the old style) is also passive income… so is art… so is building a house or a car or pretty much any form of manufacturing.
These activities all involve building something with no promise of selling it - then trying to find a buyer… in each case you, the producer, are investing up front in a venture which may or may not succeed and then hoping someone will pay you for it.
Removed by mod