Whose fault is that? And who should fix it?
I'm not interested in whose fault it is, or who will fix it. I personally doubt it could be "fixed" without a massive intervention, but I don't really care one way or the other. It is what it is. The point is, it is the state of things, and so we shouldn't allow that oligopoly to further distort their own or other markets through measures that are explicitly anti-competitive (exclusivity contracts that keep out any possible competitors) as opposed to measure that are competitive (cutting prices, offering new and better services, etc).
There is sometimes a fine line. But exclusivity contracts by a monopolist/oligopolist in any market are a pretty clear case.