“But, it turns out that if you don’t want Slack to use your data, you have to email the company to opt out.”
Slack trains its models on customer messages by default, and the opt-out is an email to the company. The terms have sat there since at least September 2023. A Slack engineer admitted the privacy page predates Slack AI and needs updating. Paying customers found out from a Hacker News thread, not from Slack.