The Italian cybersecurity company Hacking Team, which sells hacking software to law enforcement agencies, advised police to jailbreak i Phones to allow tracking software to be installed on them.
Moreover, during the unlocking process, there are options to Install Cydia and i Pad baseband as well.
Computer criminals may jailbreak an i Phone to install malware, or target jailbroken i Phones on which malware can be installed more easily.
Jailbreaking permits root access to i OS, allowing the downloading and installation of additional applications, extensions, and themes that are unavailable through the official Apple App Store.
i OS jailbreaking dates back to the original i Phone in July 2007.
Well, if you hit this Restore button, you will lose all your Cydia apps and cool customizations. If you upgrade, you will lose about 500MB of space.
If you do that again on the other update, you will lose another 500MB, and so on. The data loss is because Cydia moves your files around to free up space.
Apple has responded with updates to i OS: patching exploits and upgrading hardware.
Jailbreaking communities have not been legally threatened.
However, their reasons for banning apps are not limited to safety and security and may be regarded as arbitrary and capricious.