Google is getting pushy now because they can . They've become habitual and omnipresent. Now is the perfect time. A couple of years ago I could see Google's vendor lock-in strategy unfold. I've been trying ever since to completely purge myself of Google, but it hasn't been easy. For anyone thinking of doing the same, be prepared to test many services out.
Unfortunately Android's still the only really reasonable choice. Apple and MS are far more restrictive on the devices, and nothing seems to come close to the Nexus line of devices anyways. It's pretty annoying that I can't rate apps I buy though.
I don't want "open" necessarily, I want "respect" (for my privacy).
Unless you're going to inspect all the code/apps running on your system, an open-source OS isn't necessarily going to guarantee your privacy.