While I agree with the article about the problems of profit-driven schools, the whole situation (and the article in parts) points to a imho bigger problem in most education systems: Profit-driven schools cater to the more able, easier to educate and more intelligent pupils. Why can they do that? Because public schools almost everywhere insist on coeducation of the most and least gifted. This is severely holding back…
The article describes how for profit schools specifically pick "gifted" (aka easy to teach) children and then cut teaching staff to take the difference as profit. Yes, these students will still get better grades and thus make the for profit school look better than the public school but they absolutely fail to cater to the needs of "gifted" children.