Comment by hedora

You seem to be forgetting who writes the regulations that regulate this stuff.

Less cynically:

I think signal is likely a superior choice from a privacy and usability perspective.

However, I imagine the hospital probably wants the chat logs to be an immutable part of my medical record. That's probably helpful in the case of bogus malpractice suits, for example.

In fairness, state-of-the-art practices store all this data in an enterprise storage array at the hospital (with a remote backup in a colo or something), not on hardware owned by Big Corp.