I think this is the answer. Mobile OSes have been designed from the ground up to conserve data. Desktop OSes are a free for all. When a user takes the active s

I think this is the answer. Mobile OSes have been designed from the ground up to conserve data. Desktop OSes are a free for all. When a user takes the active step of tethering, they know what they are getting into. If mobile data was built right into the computer you’d probably see headlines like “MacBook causes $2000 in data overages”