@dangoodin these days we mostly use Matrix and mostly open channels too. Slack is still there but it's usage seems to be rapidly declining. It's a closed platform with no form of encryption or even other basic security measures. Matrix isn't perfect, but as a platform that can be both open and secure, it works pretty well. And I'm told that its federated moderation features really helped in rapidly kicking out bad actors and trolls, and ensuring they stay out of it.