[inigyou]

1. That exponential is a sigmoid in disguise. Who knows if it'll top out above 1 billion?

2. If you don't have an unfair anticompetitive moat, you'll have competitors, driving your profit towards zero as usual.

[kristianbrigman]

1. Who knows that it will? The point is just that it’s possible.

2. This is one of the (many) side assumptions that are worth discussing.