You’re not describing a situation where your made a series of investments with a high ROI, you’re describing a “one-hit-wonder” scenario. Ask any successful game developer and they’ll all (sorry, the overwhelming majority will) tell you that making a viral game as you’ve described is hugely luck-based.
Similarly, all (sorry, the overwhelming majority) of those 3000 billionaires would agree that you don’t amass their amount of wealth via a one-hit-wonder. Yes, it involves the fortune of having the opportunity to exploit others (usually born to already wealthy families), but then also requires a pattern of exploitation (I think they’ll be less willing to admit that one. Maybe Theil would.)
If you’d like to adjust your hypothetical scenario to not be based off of a one-hit-wonder, and instead model a sustainable pattern of good investments, go for it. But I believe I’ve already addressed that possibility with my “small business” example in the previous post. It simply doesn’t happen.
Yes, anything that turns a profit is based on a supply/demand gap, the key word I used was “unsustainablely”. I’m not talking about selling a video game for $100 when players want to pay $20, I’m talking about selling the cure for a disease for $10000 when it costs $1 to make. Price gouging. Exploitation.