Didnt OpenAI build a browser not just AI inside a browser?
Not everything, but a company can be specialized in a lot of different things, Samsung for example, or megacorp in Japan.
That’s the other side of diversification: undercutting your competition until they go out of business. Then prices are raised again.
If labor is not your constraint, you wouldn't be diverting your specialization.
The real reason is the models just aren't good enough.
Running a single successful fully automated business at scale would be a huge milestone and a legendary PR achievement, but the tech just isn't there yet.
A machine with infinite attention and infinite knowledge probably could specialize in everything.
https://apps.apple.com/us/iphone/charts/36
That actually makes me wonder if Apple apps are not included because they come pre-installed.