Defining the pie gets really complicated. Sometimes you make one pie bigger and another smaller. Companies like Lyft certainly decreased the taxi pie but then made a new one altogether.

I believe there are fair ways to extract value from what already exists by creating a better version in a competitive market. Ultimately I think the value should be defined at the customer and societal levels. The tangents and levels in between make things messy.

Adding efficiency is a means to add more pie.

Obviously, my comment is a simplification. It kind of goes without saying that simplifications leave out a lot of nuance and gray zone.