One doubt that genuinely in my mind is the security perspective while using Cydia apps. We certainly know that Apple is tough to ensure that Appstore apps are secure enough. But what about the 3rd party apps coming from Installer and Cydia? How much can we trust them? Raising the same concern Apple for the first time has termed Jailbreaking as illegal.
According to Apple tampering with iPhone’s operating system and boot-loader would cause reliability issues with the handsets. The Apple iPhone OS code itself is protected by copyrights. The company also argues that the practice will contribute to the prevalence of pirated software and the illegal distribution of other protected content.
While EFF that is seeking exemption for Jailbreaking under DMCA, Apple certainly has a valid point (apart from securing their commercial interests with the AppStore.) We are also concerned about the security of jailbreak devices, Apple has a tough stance for security of apps that are delivered through App Store. Moreover, Jailbreaking finds holes in the iOS and exploits them, this can be open window for hackers.