Probably because Apple is very concerned about providing a secure experience for their customers. By requiring that all app developers use Nitro they can rest assured that those apps are at least as secure as mobile safari when it comes to browsing the web. If Google was use their own JIT compiler in Chrome for iOS and there was some serious security exploit that affected users as a result do you think users would blame Apple or Google? As far as most non-technical users are concerned, they would likely blame Apple because that&#x27;s who they bought the phone from.<p>There <i>is</i> competition in software, btw. You can buy an Android or Windows phone and get a completely different web browser in them.