They are using their scale for bloat rather than a scale advantage.
https://www.epi.org/publication/uber-and-the-labor-market-ub...
The tone of these emails is odd to me. Dara is not stupid, he must know that Uber is bloated and over-engineered. If there is a long recession affecting their business, they will inevitably have to trim some of this fat. Surely _that_ is what was discussed with investors.
I tend to think this is bad for economy in general, as it emphasizes capital over innovation.