I disagree. It is almost as if at work talk on work provided media like slack, should be work related. What is next? People complain about mutiny related chat rooms being banned by the Navy?
Looking at my company slack, we have a ton of channels with a "soc-" prefix, which we use to designate a channel that's there for social purposes rather than work. I think my employer would have a mutiny on their hands if tomorrow they decided to shut that down.