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> Ethically, there is nothing wrong with this system if the exclusion can be applied equally to any ethnic group.

That is only shifting the responsibility to the person clicking (or not clicking) the checkbox.

... thereby exonerating Facebook from the racial discrimination imputed to its advertising problem.

Are you really suggesting that platform providers are fully accountable for the abusive use of their services?

It shouldn't be an option. So yes, they are accountable.