Based on Slack* practices of using your data to train their "AI" (probabilistic machine), I'd consider instead using an open source (truly) tool like Discourse for your collaborative needs. You can download it and install it on your own server, or opt for Discourse hosting at a reasonable fee.
It's funny because listed as one of the users is OpenAI. I suppose OpenAI themselves value privacy and not having their content scraped. 😂
*Slack is owned by Salesforce