Well what other options are there? Self host services yourself?
Have cloud providers use a "partner" like in China?
Office 2021, or just don’t use computers in school.
Or libreoffice...?
Libreoffice of course
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 or pay for development of your own FOSS equivalent. Enough piggybacking on proprietary tech with tax payer money.