Kid's online activities are criminalized when schools snoop and hand that information over to the school resource officer.
I don't ever want a visit to the wrong website to cause my family to be sucked into the legal system. So, I provide my kids hardware, and refuse to allow spyware to be installed and that includes browser extensions. Every year I have at least one of the three schools my kids are at try to force us to let them install something, and they find out:
0. The spyware they are using is creating a lot of network traffic to unexpected (and often unwanted) places and is much more intrusive than parents are led to believe.
1. Government, and that would be a public school, does not have legal right to surveil my kids without a search warrant.
2. They have no right to install stuff on a computer they do not own.
3. Public schools cannot deny education to my kids because we opted out of surveillance.
The final resolution is usually the district's lawyer telling the head of IT they have to stand down on the issue.