I generally don't like EU, but one of the things I love them for is how they mess with American megacorps.
(The other reason would be creating lasting peace between European nations)
The antitrust office is actually about the oldest part of the EU, with roots back in the ECSC: They saw the need to get rid of internal collusion to actually entwine the national coal and steel industries. Think of it as a bigger bully saying "We're the cartel bosses around here".