The latest challenge to Apple’s business model comes from the US Department of Justice, which has lodged antitrust complaints against the firm that target the entirety of the iPhone ecosystem. Thanks to Apple’s entrenched position in the US, a somewhat unique marketplace, this case has a strong chance of doing damage to Apple. Ten years ago, Apple was still a minority of new smartphone sales in the US, and so any complaint regarding practices in its own walled garden could be dismissed. Apple could wriggle out of such charges by pointing to the Android ecosystem as an alternative, should you not want the Apple experience – while simultaneously arguing that it was the superior choice for consumers. Currently, Apple has…