Because the US has way more corpo-sycophants than anyone else. What other country would have enshrined a monopoly into law?

Look how absurdly anti-union everyone is. That was a purposeful century of marketing by companies, and the US populous bought it without complaint.

Look at Citizens united and the absurd way people will twist very simple concepts just to ensure that corporations have MORE rights than people. We have no difficulty with limiting agents of the Government from doing things despite "the government" being made up of people just the same a corporations, but bad actors continue to insist we cannot disambiguate between an individual doing an individual act, and someone doing an act as an agent of say an LLC. Limiting a corporations speech does not limit the speech of individuals, only of agents of the corporation. You can say stuff as an individual that are illegal to say as an official entity of the org.

What other country would have enshrined a monopoly into law? How about all of Europe for one? The entire guild system was all about granting monopolies. And that is before getting into the India Companies. An officially enshrined monopoly has been the norm far more often than officially prevented monopolies.