What services is Apple is?
An iTunes account is required for App Store purchases, but that's about it. You can load on Google e-mail, maps and browser after that, if you wish. The point is that Apple doesn't make money from its services, so it has less of an incentive to stop you.
http://www.anandtech.com/show/8633/apple-q4-fy-2014-fiscal-r...
The debate over whether Apple makes money off hardware or software is ridiculous. Every iPhone contains both Apple hardware and software, and works in concert with Apple services, designed to be a cohesive whole. It's ONE experience, designed top to bottom to work together. That's Apple's entire value proposition.