Telling others your salary is allowed and should be encouraged, it is not a security concern at all nor does it imply you are going to release any actual confidential information.
Salaries are only secret if the person receiving it wants it to be. People should be able to say how much they earn without retribution. There is literally nothing wrong with it and it doesn't mean that they are going to broadcast actual company secrets.
If its a big deal for the employer then they should have put it in their contract/NDA and made that clear prior to employing them (but as I understand it that is illegal in a lot of places for good reason).
this is such utter bs. no trust— typical shitty capitalist trash
You can fire someone for no reason at all in much of the US. It's employment-at-will.