It's not even like unbounded exponential growth is a new or "startup" thing either. PGs story is just the grains of rice on the chessboard legend. (or depending on the culture telling the story, perhaps wheat on a chessboard, according to google)

Like poet/warrior/advisor that convinces the King to give them one grain of rice on the first square of the chessboard, two grains of rice on the second square, four grains of on the third square, eight on the fourth - and so on, doubling the number of grains each square until the 64th square. The King can no more deliver 2^64 grains of rice that PG's founder keep her 93% growth rate consistent for 64 months (or even the calculated 9.5 months to make her a billionaire).

Yes, it's true that a very few tech startup founders create billion dollar wealth by "making what the people want" - but anybody trying to tell you the naive compound interest math makes it inevitable, is trying to sell you something (like perhaps their companies startup accelerator program or venture capital investment opportunities).