Another factor might well be related to avoiding excessive accidental data roaming; e.g. helping to avoid surprise roaming bills, interacting with the EU50 data roaming cap etc. (At present people easily run up bills for several thousands by downloading a single TV episode.)
Intl roaming is quite prevalent in places like Europe so it seems well possible that related sensibilities may also be informing these decisions.
Intl roaming is quite prevalent in places like Europe so it seems well possible that related sensibilities may also be informing these decisions.