Yes, I think another way to think of the 'between-taker' idea is that an entrepreneur find ways to use existing resources in a new way that creates more value than those resources could previously create. Sometimes those resources are physical (machines, buildings, etc), but they can also be human beings.

I think it is reasonable for YC to have an investment theory that is something like 'productivity enhancements are making many talented human resources available more cheaply, a business that finds a way to use them could do well.'

But, I think the Uber example is a little unclear. It seems likely to me that driving is going to be automated away in 10-20 years. And, since so many adults drive (even those with other jobs), there is a massive incentive to find a way to automate that activity and make it safer.

I think there is a bit of a paradox - as the number of people employed in a task increases, the incentive to automate that task increases as well. I am not too optimistic that creating large numbers of long-term sustainable jobs is easy, but I think the attempt to find uses for undervalued resources makes as much sense for humans as it does for any other resource.