Yes, but that's by design in some sense. Monopoly is a carrot, entrepreneurs are donkeys on treadmills chasing after such carrots. The market's value to society in this metaphor is the energy produced by the treadmills, so while it's critical to offer donkeys the promise of a carrot, it's even more important they don't actually get it, because then they step off the treadmill and become a nuisance.

I agree you could make laws allowing for self-busting. As in, some management whistleblower having evidence of monopoly practices, reports it and the company gets autosplit- with the dissidents as manager of the new company.