[wmf]

It seems like any company can be legally forced into spying on you, and if that isn't already the case then they can always pass another law to make it so. Thus any such promise would be essentially toothless. Probably the strongest thing they could say would be "we only spy on you to the exact extent required by law, but by law we can't even tell you what that extent is".

http://www.aclu.org/national-security/doe-v-holder

[itistoday]

OK, but the link seemed to have a happy ending, so I'm not sure if what you're saying is still true:

As a result of a settlement in the case, the FBI lifts the gag on Nick Merrill, the ACLU's client and the first NSL recipient to challenge the records demand.