Article from 2017 citing low pay as a reason for pilot shortage:
To quote Disney:
"If I were queen of the world, I would pass a law against private jets, because they enable you to get around a certain reality," Abigail Disney recently told The Cut. "You don't have to go through an airport terminal, you don't have to interact, you don't have to be patient, you don't have to be uncomfortable. These are the things that remind us we're human."
As with any labor shortage, youre right that it's really "a shortage who are willing to work for the offered salary."