I don't disagree with that, but it doesn't really answer the question. "Infrastructure" doesn't mean the same thing as "layer of abstraction", there's an essent

I don't disagree with that, but it doesn't really answer the question. "Infrastructure" doesn't mean the same thing as "layer of abstraction", there's an essentialist quality to infrastructure. You could build an infrastructure _using_ self-driving cars (as an example), but they are not an infrastructure in and of themselves. There's not a huge heap of difference between Instacart and bike couriers (except they provide slightly different services), and while couriers are a very useful service they're really not infrastructure.