Worth mentioning though is that they didn't invent Common Core Standards; they support it. Common Core was also preceded by No Child Left Behind, which shifted emphasis in education in a similar war.

All that is to say that the issue didn't originate with the Gates Foundation. It goes much deeper and is arguably a broad societal issue. No one agrees on how teaching should be done, there's insufficient coordination, people doing the work lack resources and incentive, and kids suffer a lot as a result.