Earlier quoted context omitted.
The section from the OP I'm referring to is: Contact us to opt out. If you want to exclude your Customer Data from Slack global models, you can opt out. To opt out, please have your Org or Workspace Owners or Primary Owner contact our Customer Experience team at feedback@slack.com with your Workspace/Org URL and the subject line “Slack Global model opt-out request.” We will process your request and respond once the o…
There's some shenanigans going on here, of course. The section I was looking at says... To opt out, please have your org, workspace owners or primary owner contact our Customer Experience team at feedback@slack.com with your workspace/org URL and the subject line ‘Slack global model opt-out request’.
For reference, I got an email back saying I was opted out and a bunch of justifications about why it's okay what they did and zero mention of the legality of opting people in by default.