We did this at a previous startup and it had nothing to do with smoking guns. We were in healthcare and, although we had a strict policy against posting any PHI

We did this at a previous startup and it had nothing to do with smoking guns. We were in healthcare and, although we had a strict policy against posting any PHI in slack, we still purged history in the off chance that it did end up somewhere. It’s just another layer to privacy protections. It also had the nice benefit of forcing people to store actual knowledge in Notion where it could be organized and more easily discoverable. Anyway, all this to say - there are many reasons to purge slack history that aren’t nefarious (even if the practice is ill advised by some)