100% down. My experience with comms security has been such that we were still shitposting on 'official' Spam channels with people who had not been employed at that company for months. One of them even slipped up and accidentally dissed one of his former teammates on the project team channel, and that's when they ejected him from Slack. About 5 months after he quit.
They did love insta-deleting GSuite accounts without switching doc ownerships or transferring associated accounts, effectively annihilating a lot of vital design stuff. Stuff was super-secure after that, I'll give'em that much!