Remember what Sherman said
We only have to think about the forces which drive the world, in particular money. Give a corporation more power and leverage and it will use it. History has shown this. This is why the Sherman Antritrust act passed in 1890. Sherman said: "If we will not endure a king as a political power we should not endure a king over the production, transportation, and sale of any of the necessaries of life." In our modern time, electronic communication has become an important part of the "necessaries of life". It is also obvious that words and promises don't count much. A corporation is not a person. It is an ever changing entity. In a couple of years the promises are forgotten. If an opportunity opens to make a few bucks more, for example by slowing down the competition, then they take it. This is why there are laws like antitrust laws. Without those laws, firms would try to band together to raise prizes or merge to be a monopoly. It does not need much imagination what happens if a few telecoms have unregulated control over the delivery of content. It is their instinct and necessary for their ability to survive that they have to take any opportunity to increase profit.