I can assure you, Apple is not being forced to use Corning’s product.Apple wants to use the product and wants a better price. Corning says, “I’ll give you a better price if you..” and before they complete the sentence, Apple’s tossing buckets of money shouting “JUST TAKE THE MONEY1!”
Apple and Corning's deals can be perfectly legal whereas Corning's deals with another customer might be not.
There’s little competition because it’s hard to do what Corning does without invalidating Corning’s patents.
If there is little competition in the market due to significant barriers to entry the concerns of antitrust regulators are justifiably increased and some practices that might be ok in a very competitive market might cross the line in a less competitive one.
And, JUST like with the App Store, the agreements Corning has currently HAD TO BE APPROVED BY THE EU! The EU reviewed the contracts and said everything was ok. Corning, of course, went forward because the EU said “ok”, then Vestager comes along and reneges on those prior agreements.
Where do you get the information that the EU reviewed and approved Corning's contracts with their customers?
Furthermore, the EU only announced that an investigation was started, they have not claimed that they established any kind of violation yet. The fine print in the announcement explicitly states such.
The point of an investigation is to figure out if there is a case and if there is a case they will present evidence supporting it. Until then there is no information we can use to make a founded argument as of whether the allegations are founded or not.