It's not that easy in some cases because people often vote just for the athlete (without further explanation), and sometimes they explain the reasoning behind the vote (also citing different things, for the same athlete). But in general, based on what people said:
Mixed Team: unexpected medal in Ski Jumping, the first ever for the nation in this sport.
Iivo Niskanen: waited to congratulate the last-place skier.
Sofia Goggia: injured, won a silver medal.
Kai Verbij: sacrificed his medal chances, preventing a crash with his opponent.
Brittany Bowe: gave up spot for teammate Erin Jackson, who ended up winning gold.
Lindsey Jacobellis: won gold after many failed attempts.