"Congratulations to Slack on its exit" I say as I forgot they are post-IPO.

I always thought it strange how big Slack got to begin with. History will probably remember its ultimate accomplishment was getting lots of companies to switch from direct-message communication to chat rooms. However, that was probably inevitable as an internet savvy generation took over more companies, and Slack was simply well-timed. It's not like the product was light years ahead of its myriad of competitors. It had a little better design and had friendly corporate terms.

Which is good news. If Salesforce really does ruin Slack, I have no doubt someone will swoop into the space just as quickly as they did.