There's a difference between the school allowing tracking your use of their equipment and the school requiring you to use tracking software on your own machine.
Of course, if the schooling is voluntary; either private K-12 or any collegiate level, then you just have to play by their rules or go home. Someone could definitely bring the case against a state K-12 requiring Zoom use though, were they properly paranoid, motivated, and funded.
Privacy legislation in America has not kept up with technology. But if you're going to a public school you can at least take political action at the School Board level.
Of course, if the schooling is voluntary; either private K-12 or any collegiate level, then you just have to play by their rules or go home. Someone could definitely bring the case against a state K-12 requiring Zoom use though, were they properly paranoid, motivated, and funded.