There's been a big push to replace pen and paper with computers in school. To the extent that one school here that taught their students to write with pen first got reprimanded by the authorities and had to introduce computers earlier. Since you replace both books and pens with a computer, it kinda makes sense from that perspective that every student has their own computer.

Ironically many people still seem to be poor at comp-sci. Chrome and iPhone apps teach you to swipe and push buttons, not how computers or traditional software actually works.