You can read the details of this completely predictable and in general ridiculous ice-dancing judging scandal here, here, and here. I’m not going recount the details because the details are misleading.
The ethics story is that the American ice dancing team of Madison Chock and Evan Bates lost the gold to the French team of Laurence Fournier Beaudry and Guillaume Cizeron because a French judge, Jezabel Dabouis, favored Beaudry and Cizeron by nearly eight points (make that “points”) over the three-time world champions in the free dance, a margin inexplicable when compared to the scores of the other judges, and so large that if her score were removed entirely, Chock and Bates would have won the top prize easily.