Their families pay for it.
Homeschool families pay 100% of their property taxes
But those same homeschool students would only be using some of the extracurricular services.
That would reduce the number of students in government schools, which would reduce class sizes.
Then, families could spend some of their children's education dollars on sports at the government schools and the rest on homeschooling expenses.
Families would be able to customize their children's educational experiences.