Earlier quoted context omitted.
I’m pretty sure it is logged. Perhaps someone can confirm but can a sufficiently privileged user (not a Slack employee) read contents of private channels? DMs?
Yes, for the upgraded plans you can export data from all private channels and direct messages. It also doesn't notify users when this happens. You can't watch the chats in real time or anything. People should assume communication on company services are all logged.
And then, as I should have foreseen, they demanded all communications within the company relating to their lawsuit. I’m not a lawyer, but, for whatever reason, our lawyers considered it to be within their rights; I’m sure it wouldn’t have applied to privileged legal discussions, but we were just code monkeys so I suppose our chat logs were fair game. I’m never doing that again. I don’t think their lawsuit went anywhere, but it was mortifying all the same, especially considering our brand was quite a friendly and liberal one.