All the points that you raised are either plain illegal (piracy) or against terms of services you use (tethering). Not sure about carrier unlock in HK, because

All the points that you raised are either plain illegal (piracy) or against terms of services you use (tethering). Not sure about carrier unlock in HK, because for example in my country (Poland) it's legal to unlock your phone and there's even this law that every carrier has to provide means to remove the simlock off the device after the end of their contract.