It's not an abuse of power if a) it's contractual and b) it's private property. One doesn't automatically become a victim, incapable of provide genuine consent to the terms offered, by virtue of the party offering the terms having a service that they badly want or need.
If you believe otherwise, then I challenge you to convince a court of that. Courts, under common law, will invalidate any contract where the parties to it did not provide informed and genuine consent to the terms contained in it.
Resorting to legislative intervention suggests lacking the confidence in the validity of the allegations that premise it to use the judicial free market track.
>>as someone living in a country with multiple nation wide and regional state owned television channels I think they are terrible idea because they are extremely inefficient compared with private ones and also degenerate into propaganda machines for the political party in power, and the longer the same party is in power the worse.
Two points:
a) you think the polity is incapable of managing large organizatons competently enough to compete with shareholder-run private enterprises, yet you think this same polity can craft effective cookie-cutter rules that will affect millions of interactions a day. It's not a coherent model of the world.
b) the state is not limited to organizations under its direct management to support its policies. As I explained in a response to a sibling comment of yours, the state could still tap market forces to bring about public squares that abide with its guidelines, by providing subsidies to private parties developing such platforms, in exchange for the parties entering into an irrevocable covenant that requires them to follow the state's rules.
Yet another option would be the state funding decentralized open-source protocols that are capable of entirely replacing centralized parties in many markets. The state, being publicly funded, is the only entity capable of cost-effectively funding non-profit initiatives like this that produce public goods.
My larger point is that the state should not be monopolizing industries. It should provide alternatives to the private options. If it fails, the public still has the private options. If it succeeds, it did so by providing an option superior to those provided by the private sector. This imposes accountability on the state, by leaving it with competitors to act as a yardstick, while ensuring its interventions only impact the market to the extent that they improve it.