For gymnasts, the Olympics are the only event where they get much public exposure at all. And your comment about “training for four years” misses an obvious point: In this case it’s FIVE years because the 2020 Olympics are being held in 2021. I wonder how much this disruption and COVID-related anxiety has to do with some of these meltdowns.
Yes to all that.
About the tennis players, Osaka withdrew from the French Open after she was fined for declaring she’d boycott all press conferences. She then refused to turn up for Wimbledon as well. Those are two of the 4 majors with all the money, prestige and publicity that come with them.