It's strange to think of changing a rule just to disadvantage someone in particular:sarcasm:
Really? I assure you, the Zayak rule was not made to advantage Elaine Zayak.
And the Witt rule to ban overly sexy costumes was not made to advantage Katarina Witt.
Sometimes rule changes are not as explicit about it, but it is often the case that rules are changed to specifically to disadvantage one skater, or to specifically advantage another.
But it is always the case that all rule changes benefit some skaters and disadvantage others.