Because computers are for nerds (the bigger it is, the MORE computer it is); only boys should be nerds; therefore, girls select against using computers. It sucks.
Using a mobile is like reading while looking through a toilet roll, and typing by using a straw in my mouth :P
I often get questions from people on WhatsApp saying "How can you reply so quickly??". Well duh... I use a real computer :) Anything I can do on the mobile I can do twice as fast on the computer.
For me it just 'hurts' when my brain cycles are forcibly wasted. Not just with this, also with those stupid mandatory trainings in work where the narrator is so slow to make sure even the most mediocre non-native numbnut can keep up. It just frustrates me so much when I'm forced to listen to that (usually I spend my time looking through the javascript to find a way to turn off the non-skip setting :P )
I actually got caught out by that once when an intern noticed I had only spent 1 hour on a course everyone else spent at least 3 hours on :P But I told her I was on a plane so when I finished it I was in a different time zone :D