Charter schools are a mechanism for opt-in flexibility within the public school system to enable identification of generalizable improvements; if there isn’t systematic evaluation and feedback into the broader system, that’s definitely an issue, but (unlike vouchers, which are low-accountability subsidies to nonpublic schools), that’s what charters are for.
it also increases the divide between rich and poor (https://www.seattletimes.com/education-lab/do-charter-school...) all while taking resources away from the public system setting it up to fail more while also removing all incentives for politicians to fix it (their kids go to the private schools)
here is a video going into charter schools and showing a number of rather negative outcomes https://www.youtube.com/watch?v=l_htSPGAY7I
Not to mention in time you’ll just get charter school mega corps that don’t have too compete.
private prisons are not Goverment granted monopolies and that has gone horribly wrong.
Teachers want to teach and do a good jobs generally but are prevented from doing so by admin/policies that set them up to fail