It’s true that iOS is probably the most closed platform on the mobile market, and Apple have been taking special care to ensure that it stays that way, constantly plugging security holes that allow users to jailbreak their devices.
It’s not that they don’t want their users to have access to customization options – or so they claim. The issue, according to Apple, boils down to security/safety. By locking down their operating system – and devices running it – Apple are guaranteeing that they control what happens with that system, in terms of applications allowed to be installed and what they can do with the system in the background.
This means that most users don’t need to worry about viruses and other types of malicious software, and it’s generally easier to use the operating system on a daily basis. On the other hand, it also takes away from the freedom of the user to configure the OS exactly how they want it.
Which is why tools like TaiG’s jailbreak program exist, as there are lots of users in the Apple community who want to have more control over their devices, and are willing to circumvent the restrictions imposed on them by Apple to do that. As we said above, this voids the device’s warranty, but many of those users simply don’t care.