Quad9 is not sponsored by either the Manhattan DA nor the City of London Police. Both are users of Quad9, neither is a sponsor of Quad9.
https://quad9.net/about/sponsors/
When you are that closely connected to US and UK government, don't be surprised whan people don't trust you.
B) That's a straw-man, as we have not asked for anyone's trust; quite the opposite.
C) We serve the public, everyone. Is your argument that the US and UK governments are excluded from the definition of the whole? Or that because they, like everyone else, are members of the set of the whole, that this somehow reflects upon us?