Earlier quoted context omitted.
What is scope for Uber-likes? What is network? They're simply leveraging a brand - it is almost no moat versus a competitor, especially if they have a structural advantage. An example advantage would be an autonomous car manufacturer entering the market - they can simply blow Uber out of the water on cost alone.
No moat? Do you think brand recognition is worthless or I'm missing something? They have a large user base (I presume) already. I'm not sure one could build one from scratch just like that. It would need a big player to enter the game.
These would be the biggest threat to Uber's market share since they could easily compete on cost and distribution alone.