From what I've gathered, Signal use was prolific among people in this administration and the past one.
I'm not surprised. My own company sends out several emails that Whatsapp can't be used as it's not secure, yet I get Whatsapp messages from leadership I work with constantly.
People ignore directives all the time. Usually out of convenience.
People have even called it out in a Whatsapp chat "hey guys, we're not supposed to use Whatsapp" and people usually ignore it.
That's not at all what's it's like to work with classified data, even deep down the subcontractor chain. They constantly drill into you to respect data classification and the consequences of ignoring these rules. Nobody ever does what you describe.
I'm not surprised. My own company sends out several emails that Whatsapp can't be used as it's not secure, yet I get Whatsapp messages from leadership I work with constantly.
People ignore directives all the time. Usually out of convenience.
People have even called it out in a Whatsapp chat "hey guys, we're not supposed to use Whatsapp" and people usually ignore it.