Simple statistics tells you that somewhere there has to be a legitimate charter school. Unfortunately the minuscule chance of finding it is greatly overwhelmed by the inundation of the other types that are designed by noneducationally oriented money bags who either are looking to make a profit or who are interested in paying themselves and their family members exorbitant salaries for being administrators of some kind at those schools.
The profit motive means that expenses that don’t pay for themselves, like libraries, computer centers, counselors, specialists for handicapped students, and nurses, but which nevertheless are necessary for a complete education will be severely restricted if not cancelled altogether. The same goes for those people who rent their building to the charter school they created and then collect way out of line salaries for administering the charter school along with equally ridiculous salaries for their relatives on the board of directors.
If you are running a school, and if you prevent the parents of the kids from having a voice in how the school is run, aka school boards, then you are looking at absolute power and the inevitable consequence.