Earlier quoted context omitted.
Note that G, FB, A and MS are not in a position where they can write such disclosure. I am not arguing with your main point, I applaud FastMail for taking a stand - it's just that USA companies must use "ambiguous slimeball statements" to at least appear clean (because they are not). I would argue that if FastMail were an USA company their statements (if any) would be just as ambiguous as those of G, FB, A and MS.
I never understood this rationalization for what is essentially a corrupt behavior. People find excuses to keep the corrupt system going. I see it as a collective madness. Those companies, being a huge influence on the internet culture and economy, a trend-setter, one might even say the internet gatekeepers - I think they not only should disclose and vehemently oppose any attempts on user rights, but it is their mora…
Keep in mind that these companies' only obligations are to their shareholders.