Verizon can distinguish Tethering data from Smartphone data only when you "legally" tether. Your data connection, 3G at least, literally disconnects then reconnects under your @dun.VZW3G.com address. DUN obviously being dial up networking. 3G is *technically* very fast dial up, your phone is a modem, and it literally dials in on #777.
Anyway, Verizon cannot tell if you are illegally tethering, 3G or 4G, and it would cost more money to monitor us for "ungodly" data use, they'd have to hire more people for something they can't really dispute, using your unlimited data. Especially since they can't prove you are tethering, even with 32GB of data use per month.
But even if Verizon actively gave people the boot, so what, just go to Sprint, even they have LTE now.