So the problem isn't Appstore monopolies so much as software vendors deliberately curtailing functionality or performance to give their products a marketing edge. Those of us who have Windows know you don't need to go to an application store to get stuff pushed at you that causes functional problems. This should be illegal --seriously, "with extreme prejudice" illegal -- but vendors can blow so much smoke around that regulators are completely at sea about what's really going on.
All the application store noise is about others wanting a piece of the action. Not a competitive piece -- they see a duopoly and want in. Once they've got their seat at the table (trough?) then they'll be just as badly behaved. They're not worth pandering to.