Every example you gave is still inappropriate, as they are not about work. I worked in the public sector and that would have been shut down. Federal employees are held to a higher standard, especially if they have a high security clearance. They get funny about spending because it is tax payers dollars. Using a work computer on a government account during paid hours to talk about personal things, nope. There are a bunch of rules they were breaking.

I’m not saying they they weren’t targeted, but they were still in the wrong.

But it was a group chat for work. In anything even a little bit security driven it’s only for work related activities, just like email. I can’t imagine talking about anything related to sex or medical operations on teams.