This is great in theory, but in practice it’s rare to develop something that can be passively licensed off. Usually it becomes a business that requires constant attention as it scales. I know a few people who have developed apps that sold well initially and looked like easy money, only to be buried under a flood of copycat apps as soon as the market realized the opportunity was there. The best success in cutting the cord seems to be building a company which is then sold off, but that’s hardly an easy path.
This feels a bit like the “passive income” pipe dream that is frequently touted in FIRE forums but rarely comes with practical, real-world examples.