One difference is that an adult can choose not to use Google.  They can also (usually) choose to install ad-block or ghostery or a similar plugin and thwart the tracking.<p>If using Google is mandatory for a class, then the students don&#x27;t have any choice in the matter.  And I think school computers are locked down to prevent installing browser extensions, so that option isn&#x27;t available either.<p>Also, because it&#x27;s a pet peeve of mine, it <i>raises</i> the question.