Charter schools are not public schools. They are private schools that contract with the state.

This week, a charter school in Southfield, Michigan, announced it was closing three weeks before the end of the school year. Staff and students were stunned.

http://www.fox2detroit.com/news/local-news/258195926-story

Taylor International Academy closed abruptly on Wednesday.

No doubt, Betsy DeVos would say that’s the way the free market works.