The first exception that comes to mind is tarsnap. Who does not only offer that promise, but offers code and reasoning for why it is impossible for them to compromise your data even if law enforcement comes calling!
Lavabit also comes to mind. While they could have technically compromised their customers, when law enforcement came calling (after Snowden famously used them), the owner chose to shut down instead of complying with the requests of law enforcement.
The first exception that comes to mind is tarsnap. Who does not only offer that promise, but offers code and reasoning for why it is impossible for them to compromise your data even if law enforcement comes calling!
Lavabit also comes to mind. While they could have technically compromised their customers, when law enforcement came calling (after Snowden famously used them), the owner chose to shut down instead of complying with the requests of law enforcement.
That said, such heroes are few and far between.