Why doesn't another competitor enter the market? Well considering the market the competitor needs to be big enough to stand up to a literal attack by the incumbent. In the best case the incumbent and the newcomer both end up being about the same size and they compete. Alternatively as this hypothetical investor who has the capital to get about half of this large market I would do better spending the same investment on a smaller market were I can capture the whole market and force a higher percentage return on the investment. You can look at comcast/time warner to get an idea why these two big encumbents might not compete even without forming a cartel. If someone was to point me at google fiber as an example of how the market will be disrupted I'd point out the fact that the local companies are trying to use the legal system to thwart google fibers growth even within the city and if these companies were the enforcement of the legal system I don't particularly believe google would get a fair shake of the stick.
What could be worse? What could be worse than conducting a theft from people calling it a service fee, then be bribed by corporations and not delivering the service to serve a corporate interests? Simple math: a company pays (it's not a bribe it's legal) the protection company with $1, the protection company allows $10 of somebody's stolen property to be used (so it doesn't cost them anything) for that company and that makes the company $100. In a system with a democratic government, the official has to at least pay lip service to working for the public good and it's illegal to accept that payment.