I know of 3: Shibutanis, V&M, and the Zhangs. I don't think taken advantage of is the correct term, exactly; the rule was applied in their cases. I daresay it has happened at smaller competitions, but I haven't watched them.
Would Tonya Harding (1994) and Noburnari Oda (2010) also be on this list? Though I think the latter got a deduction for a costume problem.