The de Medici Family was super-elite. Highly suspect of being into witchcraft. Used their power/$ to get family members elected as Cardinals and even the pope. They are responsible for the "renaissance statues" all around the Vatican, many of which were taken down years later for their homo-erotic/risque poses (some still remain). Not good people.
Hard to find too many elite families without some element of corruption. That doesn’t mean every art form the family endorses is immoral!
I don’t think her family actually invented ballet, likely the people who did remain in obscurity, rather they promoted it in Italy and facilitated it becoming popular in France. I’m no expert on this particular topic, perhaps you are? 😊😉