No I'm afraid
it is Apple who wants these restrictions in data plans. Why? i dont know but here in Finland the situation is that one year ago Apple refused to accept ELISA operator from its store and only allowed 2 major Operators which used Data limits per month.
I use Elisa Prepaid 3G mobile as my main internet connection trough a 3G-Modem Router and my data usage is about 30-40 gigs per month. No extra charge for tethering either. Costs about 20 euros per month, speed about 5mbit down/up both..
I have only one SIM card so when I get out of home, I put the SIM from my 3G-modem to my (android) phone and wi-fi tether the connection for my PowerBook
I just had to register here and comment on this data throttling/tethering thing because things just sound so weird to me how you guys do things in US...
Maybe you have lots of Wi-Fi networks available then? We dont have those at all...
http://www.digitoday.fi/data/2011/03/25/elisa-kieltaytyi-ipadin-datakatosta/20114242/66
Thats the link to news that Elisa 3G operator refused to put data limits for the iPad and it was Apple who wanted these data limits. Yeah I know that you dont read finnish but I know that here are some Finnish moderators who can confirm that I'm speaking the truth!
Yeah I use Powerbook, Android and build some hackintosh machines and play around with BSD and Linux.... So consider me not as a "fanboy" , more as a curious bystander and learner

(no windows machines here at all though)