Why QNX?
Why not Android which is the most widely used mobile OS on the market right now?
Because QNX rocks the embedded world.
Yep. QNX absolutely DOMINATES the car infotainment world, with 3/4 of the market share. GM, Toyota, Honda, Hyundai, Porsche, BMW, Audi, Mazda, Renault-Nissan, Volkwagen, and Land Rover are major customers of QNX. The main reason is customizability (QNX is willing to work with the manufacturers to develop an implementation specific to that manufacturer), open standards, and stability (an application crash does not cause the entire system to crash). The stability is why QNX is often used in power generation plants, such as nuclear powered ones.
QNX has a very long history in car infotainment systems; the company was originally owned by Harmon International before Blackberry snapped up the company a few years back.