Some of the worst performance schools are cyber charter schools, which often promote the idea that they use AI as a personal tutor.

If they could get better results with off-the-shelf tools, I'm pretty sure they would.

(Not 100% sure. Some non-profit charters pay a for-profit management company, which suggests commercial software, where the charter, management company, and software provider are all owned by the same person. They may prefer to make more money than improve student grades.)