A tiny number of enormous companies capturing the department revolving around one specific technology doesn't sound like it's bridged the acquisitions gap between Silicon Valley and the military.
I primarily alluded to AI because of obvious reasons, but yes - Cloud computing and related service products are also good examples.
But there's a great deal of department needs that don't revolve around information processing infrastructure where there aren't many success stories to refer to. Especially relating to startups.
Suggest you do some research