Proprietary Censorship
Here are examples of proprietary systems that impose censorship on what their users can access. We have a separate list of proprietary systems that censor installation of application programs (we call them “jails”.)
Selling products designed as platforms for a company to impose censorship ought to be forbidden by law, but it isn't.
Apple banned a program from the App Store because its developers committed the enormity of disassembling some iThings.
Apple rejected an app that displayed the locations of US drone assassinations, giving various excuses. Each time the developers fixed one “problem”, Apple complained about another. After the fifth rejection, Apple admitted it was censoring the app based on the subject matter.
As of 2015, Apple systematically bans apps that endorse abortion rights or would help women find abortions.
This particular political slant affects other Apple services.
The Nintendo 3DS censors web browsing; it is possible to turn off the censorship, but that requires identifying oneself to pay, which is a form of surveillance.