If Apple were the only player on the block, at least in Europe they would be under a lot more pressure. But they’re not. There are other OSs (although only one really matters), there are other phone makers.

Antitrust is more reactive. There is a market, a dominant player, said player plays unfairly, the authorities react. That reaction takes years to go through all the levels of courts available. By the time we get a final ruling, the market has long moved on. The corporations know that too. As long as the lawyers are cheaper than the money they stand to lose they will carry on.

And in Apple’s defense: the mobile operating system market is not that old. And it’s not clearly defined. And as long as there is wiggle room they can do whatever they want. Part of the problem is that the legislation dealing with antitrust on either side of the Atlantic is like copyright law: no longer fit for purpose.