Sorta, but not really. Usually what happens is that a company works with a state or local government on custom projects for so long that they create their own n

Sorta, but not really. Usually what happens is that a company works with a state or local government on custom projects for so long that they create their own niche which is extremely difficult for a newcomer to fill. This is mostly just an emergent property of bureaucracy. Eventually these niches are choked off and die, however it takes decades.