The most obvious option to me seems to be price controls, which historically have been a very blunt instrument and as far as I know, most economists recommend against them.

Err… it doesn’t have to be price controls? It could be as simple as an investigation to their pricing strategy and seeing whether the markup is obscene or not. Of course what is obscene is relative, but that’s why you investigate, so that you can see abuse on a case-to-case basis.

Also, how is this level of regulatory inspection invasive? The architectural tight integration almost guarantees that the device manufacturer has a monopoly on servicing their products—it’s just that the monopoly is being allowed because it’s the kind that allows for innovation. The regulatory crackdown would be fair and justifiable.

Saying certain prices are obscene is just an ill-defined price ceiling i.e. a form of price control.

Now that is moving the goalpost, and hard. A senate inquiry or a class action suit (that Apple doesn’t have to lose by the way) is not how “price control” is defined, and even if such cases swing in the way of consumers, there’s no general rule that specifies how much Apple should lower their service pricing.