Yes, the admins in your Slack can access your private discussions. For real privacy, you need end-to-end encryption such as Signal. Regarding IRC, I don't reme

Yes, the admins in your Slack can access your private discussions. For real privacy, you need end-to-end encryption such as Signal. Regarding IRC, I don't remember having e.g. threads or reactions. It's difficult to add features like that when the messages don't even have an id.