Can't they just charge me an extra monthly fee? I pay an additional $15 a month to Verizon for my existing smartphone tethering, and I consider it money well sp

Can't they just charge me an extra monthly fee? I pay an additional $15 a month to Verizon for my existing smartphone tethering, and I consider it money well spent every time I spend a day working on my laptop in parks and coffee shops without having to hunt down WiFi.