Google does their best to make sure the population has the most open and unrestricted internet possible. The more searches and web sites with Google adds you see the richer they get. I certainly doubt they would help restrict their source of revenue.
T-Mobile intercepts all of your data because you're connected to their equipment. When you use a certain amount of data within a given amount of time you trigger their proxy servers to inspect the http header data being sent via a program or app. The header contains the user agent that identifies the software sending the http request.
Im sure people complaining the move to jb from ics caused the block, is simply a matter of timing.
If you think otherwise, then once you get blocked, un tether, and get dolphin browser. Change your user agent to the same as msie9/10 and see that you're blocked under that specific circumstance. Its not that youre tethering, its that big bro is watching everything you do.
If someone can provide a link to googles aosp source showing they communicate with the carrier to verify that you purchased tethering, then ill retract my statement.
Pain is only an illusion...
SGSIII running Android 4.2.1
SGSII running Android 4.0.4
AOKP Build 40
HTC HD2 running Android 2.3.3 - DIED
Typhoon Cyanogen 3.1.3 MAGLDR
Ron Paul 2012 Thanks America for destroying our country with Supreme Leader Obama.