The issue is rarely that such a tactic exists, the issue is when a single player (or a few very large players) dominates the market and uses that tactic to stifle other entrants.

In 2001 when MS was sued by the government for this exact issue, it was the combination of market dominance and tactics around vendor lock in that got them in trouble.

I think in this case it's pretty clear that Apple is abusing their market position in a similar way (as simply noted by how many of the comments in this thread are "App store is good because of huge distribution channel")

So yes, in theory you could switch from Apple to Android, but honestly, Android has exactly the same problem.

I'll add, I'm in no way absolving Google of the same practice. I think it's well past time the government took them both to task for the app stores.

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Finally - Your tv comes with several ports on the back explicitly designed to let it play signals from other vendors (like your cable box, fire tv, apple tv, or any other)

So that's a trash comparison.