I mean they are not handing over data as that could be seen as still allowing access to the service and being in violation of the sanctions.

> Plus, there is no mention of complying with US sanctions in ToS.

https://slack.com/acceptable-use-policy

Under the “Do” section > comply with all applicable laws and governmental regulations, including, but not limited to, all intellectual property, data, privacy, and _export control laws_, and regulations promulgated by any government agencies, including, but not limited to, the U.S. Securities and Exchange Commission, and any rules of any national and other securities exchanges;

I’m on mobile atm, but I’m sure if I looked into the full legal copy of their terms I would find more.