He had previously built and sold two games, each of which made him millions, funding the next effort. Not infeasible, but building on repeat success.
I don’t see why this weakens the example. He has repeatedly built and released games from his own engines and now language/compiler. Money was increasingly required but he had made that money through the same process.
I don't think you can say that making wildly successful games one after the other is "feasible" for anyone who's interested in making games.
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