As much as I dislike Google, any self respecting workplace or especially a school is paying Google for enterprise/education accounts, for which Google does not collect data to sell or train their Ai, and further has specificalized written contracts clarifying SLAs of how the company/school info can be handled.

American data laws as a whole are not great, but this context is as good a scenario as you can get. It's also not a battle you can win. You will use what you are provided in a work/school context.