> Behemoths are important because only do they have the economies of scale to take massive losses on R&D and built massively expensive and complex things like rockets, hyperscalers, etc.

I think you meant:

The main advantage of behemoths is their ability to buy startups like candy when they are to big and become risk-averse. Then you don't see startups becoming behemoths anymore, except for the unicorns (called unicorn for a reason).