Cause it is the only web app I bother to use on my phone. Also I just use mozzila. And no Google still has a superior search engine.Mozilla is just as bad as Google in the Orwellian department.
You know I only use Mozilla because it uses less RAM well that fact may have changed by now depending on the updates.
Orwellian or whatnot nothing is as good for users than Chrome and Mozilla, unless you use apple then Safari should be another option. Heard good things about IE recently but have not checked it out.