> If you buy the output of some factory which is the input to your own product, is that in restraint of trade?
No. Why would you think it is? It's a restraint of trade if there's an illegal agreement between the two companies that unfairly disadvantages other purchasers. Or it's a restraint of trade if you've bought up all the other suppliers so there is only one. These concepts are enshrined in laws that are pretty simple to read, you're inventing conflict where there hasn't been any.
> This appears to be a case about a merger between healthcare companies.
That's not what it is. It's a digital healthcare advertising company. Software is at the heart of the case.
> They're presumably going to argue that you can create an account with AWS and install whatever applications you want on your cloud server and access them from your iPhone, or something like that.
Does that have platform parity with apps from the app store? If not, it's a flawed argument.
> If the courts want to find Apple in violation
The court doesn't _want_ anything. Other than for the parties to settle their disputes outside of court. When they can't, they rule, and often pretty carefully because they don't want to get overturned on appeal.
This isn't something that's happening to Apple, it's a strategy they've employed, in defiance of the law, in the hopes that they were going to be able to get away with it. That was a good short term gamble, because they almost got two decades out of it, but the courts have caught up to the market, and they're about to get the law applied to them.
If this bothers anyone that much, familiarize yourself with the laws, and then advocate against them. I think if you actually prepare to do this, you'll immediately understand that almost every consumer in America will be against you.