comments section of an article about how Google got into schools
How Google Took Over the Classroom
Personal data is private property.
Institutions are strict about protecting the public's data, and yet schools are so desperate to improve the education system that they break their own rules and give away student data to a private company that is an ad-based business.
Having been in many schools I happen to know that teachers frequently use YouTube to supplement class plans, and yet it does not fall into into the "Core" G-suite of tools for Google for Education, and therefore ads on Google can be served in schools to students using Gmail and Chromebooks and Google Classroom.