If you care about software being closed source or proprietary you probably aren't running Windows.
They'll spy on users usage habits, and likely backdoor their OS for the feds, but they won't individually exfil your browser cookies and steal money from your bank account.
A random closed-source black-box "privacy" tool though? You have zero guarantees.
What’s the difference between backdooring for the US gov’t and directly robbing/bugging you (assuming for the sake of argument that they don’t already do at least the latter)?
Used to be that you’d only ask that question if you were brown and/or write your name from right to left. Doesn’t matter much whether you were from Svalbard or Sanaa these days…
That may or may not be true, but I feel like the former would be a whole lot harder to hide, and the risk of having to reveal it in court would likely mean they aren't going to blow their cover over someone who wasn't worth it.
Like PRISM, Boundless Informant, Stellar Wind, etc?