For years, T-Mobile has blocked some tethering on tzones. This is nothing new. I used to get text messages that they had detected it and I would get upsell messages in the browser window as well. ...
Has HM made any statements that they are going to encourage (i.e. send free or cheap SIMs) current customers to convert from T-mobile to AT&T?
You don't trust them? As I posted, they guaranteed in March to keep unlimited plans for two years. They never said they would keep them forever.
From the FCC's own website, net neutrality deals with favoring content:
"The FCC's Open Internet rules protect and maintain open, uninhibited access to legal online content without broadband...
Announced 2015 August 31
GTA - Mississauga @ Square One Shopping Centre
Via HoFo App on an iPhone 5S