[usaphp]

You have a freedom to install what you want by jailbreaking it.

Its not about not allowing users to install f.lux, it's about not allowing developers to use development practices that are not approved by Apple, common - authors of f.lux are clearly doing something that is not allowed under iOS development terms and they want to change this rules just for them and let other developers use unapproved techniques which might cause security concerns for non technical users who are majority of the user base on iOS?

[TheSoftwareGuy]

while technically correct, jailbreaking is not something that apple supports, and in fact it is something they actively try to prevent.