Android Marketplace/T-Mobile following Apple/AT&T…banning tethering apps.

Android and the Android Marketplace have been hailed as the “most open” app store.  Developers and consumers have free rein.  Besdies, Android is based off of Linux meaning everything should be up to the user base anyway…right?   Wrong?  According to a peeved Android developer who goes by Seth, an app he contributed towards was banned from the Marketplace for violating the Developer Distribution Agreement, more specifically a T-Mobile clause that bans tethering.  His app isn’t the only one though.  Apparently it is happening to other tethering apps.  Why?  T-Mob had something to say about it (inside).  Is this a sign of darker things to come from the Android/T-Mobile alliance?