1. Students aren't the only people who use productivity software in schools.
2. You don't need computers at all until uni, and yet...
And generally speaking, the alternative to this stuff in schools isn't FOSS, it's proprietary shit that costs $XY(Z)/seat and steals student data for use in its anti-plagiarism feature.
The court's ruling is fine and reasonable, but the conclusions people are drawing from it are not.