Earlier quoted context omitted.
Everyone is a loser except for the investors. If you really take it to the logical conclusion, the business model is Dumping [1]: capture the market, drive out everyone else, then jack up prices when you are the only show in town. And the winners in the endgame are the investors. [1] https://en.wikipedia.org/wiki/Dumping_(pricing_policy)
I'm not doubting your point, but at the same time I struggle to name an example that did the "then jack up prices when you are the only show in town" step.
Uber, Airbnb, and other companies in this space are valued based on the assumption that they will in fact be able to reach that scale. And if they do, no doubt many of these unicorns will well exceed the trillion dollar market cap