Charging for a tethering feature is a business practice with precedence and history in the wireless industry, so it's unlikely the EFF or other advocacy groups

Charging for a tethering feature is a business practice with precedence and history in the wireless industry, so it's unlikely the EFF or other advocacy groups will be able to do much to nullify a charge to enable LTE tethering. Wireless carriers are starting to take pages from fixed/cable provider playbooks. Charging based on different access speeds of access (SD vs. HD video, or 2G vs. LTE tethering) is a time-honoured tradition with a long and profitable history. With more converged providers (i.e. wireless and wireline as a single corporate entity) and more effective cross-communication between departments, it was only a matter of time before spectrum became "fast enough" to start applying wireline strategies. I'm wondering about the BingeOn charge. The spirit of net neutrality is that content must not be discriminated against, unless the customer agrees (i.e. opt-in). T-Mobile has clearly shown they have an appetite testing gray legal waters, which turned out to be a decisive short-term competitive edge. Clearly, they're willing to go further in testing the definitions and intent of "opt-in".