as a video game player with a leaked email address due to the poor actions of video game companies, I routinely receive spam from gold-farmers with Asian names in the headers, or female names offering me pills or pornography..I hastily indicate that their spam.
although I wouldn't for a second doubt the existence of a real-life bias, I'd be curious if that kind of thing had been accounted for. I didn't notice it mentioning it in the article linked. I'd hate to attribute a spambot bias to the staff of the schools.