So the closed source platform is more open than the open source platform?Windows is for the most part an open platform.
I'm not sure you can get a non tracking smartphone (though perhaps snowden et al know, I would think not as it needs to communicate with a tower/s which can triangulate your position)
http://www.zdnet.com/article/the-worlds-most-secure-smartphones-and-why-theyre-all-androids/
http://www.zdnet.com/article/the-worlds-most-secure-smartphones-and-why-theyre-all-androids/
WRT ads, when you're developing something Im pretty sure with android you can choose any of various ad networks, you certainly dont need to use google admob, sure lots of ppl do since its the 800lb gorilla but its not the only choice, at least thats how it used to be, I assume its still the same