This is still here because ZiPhone, and Zibri's software in general, is poorly written. It has the tendency to do things to your phone that you don't want it to do and that are typically not reversible, like downgrading your bootloader from 4.6 to 3.9 without even telling you. Not to mention that the greater iPhone developer community generally frowns on Zibri for the ways that he obtains/steals the stuff he distributes as his own.
You're certainly free to use ZiPhone if you like, but use it at your own peril. If it were to downgrade your bootloader on a phone that originally came with 4.6 (and it does it using an unsafe method, by the way), you would never be able to return it or get warranty service done on it by Apple since they would notice the discrepancy even if you tried to virginize it.
If you want to take the easy way, don't use ZiPhone. Use something like iPlus or iNdependence.