IE like Crypto AG:
In 2020, it was revealed that the Swiss company, Crypto AG, which provided secure communications services to ~120 governments throughout the 20th century, was secretly ran by the CIA and West German Intelligence. The CIA and later NSA were able to read encrypted communications for many countries such as Saudi Arabia, Iran, Italy, Indonesia, Iraq, Libya, Jordan and South Korea.
Tor comes to mind.
Technologically it’s private, but if you’re America and have the resources to create and control sufficiently many nodes you can undermine the protections.
The tor rabbit hole goes pretty deep, but ya based on the evidence I’d have to say its more a US developed counter-insurgency tool, rather than a privacy tool.