The reason it's not a big market is that if glove-sizing worked the same way as phones, you'd have people with small glove size walking around in ginormous gloves. That's not the case because glove sizing actually behaves rationally, as opposed to truck-sizing, where every human in America wants a ginormous truck regardless of their actual need. Sadly, phones follow trucks, not gloves, because the former is ego-driven, not need-driven. Apple deserves credit for recognizing the counter-example to its own market presence and engages fully around it while no competitor follows suit.