I think that once you make then decision to use another companies chat system, you have to recognize that just about any information might end up on it. I can'

I think that once you make then decision to use another companies chat system, you have to recognize that just about any information might end up on it. I can't imagine trying to educate users (outside of an environment in which this thinking is normal) about what can and cannot go over which medium. The realtime(ish) notifications and questions that they describe in the blog post seem relatively benign compared to say, product planning discussions. Disclaimer: I used to work at Dropbox and know the individuals involved