But what about the digital economy? It's interesting that the length of the supply chain for digital goods and knowledge work is nothing like physical goods. Google, Microsoft, and Apple are end to end, don't have to depend on any other software company if they don't want to (until LLMs, anyway, except Google).

What is a "digital economy"? There is only one economy as far as I know. Division of company inputs into software and non-software is arbitrary and has no merit as far as I can see.