Well what other options are there? Self host services yourself?
Have cloud providers use a "partner" like in China?
There's always the option to use a NextCloud Collabora instance. Keep in mind that the French maybe choose to do so in a centralized manner since most educational facilities are state owned.
Libreoffice of course
Office 2021, or just don’t use computers in school.
Or libreoffice...?
LibreOffice or pay for development of your own FOSS equivalent. Enough piggybacking on proprietary tech with tax payer money.