You are just a bit biased by your experience working in software. IBM was smaller than it's right now, but the whole industry was even smaller.

And you actually are failing to see what I'm trying to say. IBM is a GREAT example of my point. They pivoted from a company that makes keyboards and PCs to a company that makes custom solutions with specialized hardware and software.

This sort of corporate flexibility used to be extremely rare, and that's why you have so many examples of companies that just withered away. And this corporate stagnation was the only real limiting factor of corporate growth.

It's now gone. Companies now have much higher upper limit of complexity. It's still a competition, so it's not like every company is going to become "The Corporation" from dystopias. But there's no inherent limiter that prevents it anymore.