Wait, so sanctions against a country should affect all people who share the common ethnicity in that country regardless of citizenship status or location in the world? So essentially it's a sanction against an ethnic group, not a state. Are you sure that's a reasonable idea?
How did Slack figure out this guy's ethnicity / citizenship / status? Why are they allowed to access that information and unilaterally act on it? Sounds like there's a valid question being asked here to me.