Yes, however meta and Google are inclusive of speech against the government. Under what grounds would wholesale ban be allowed then? The entire suit will fail and they know it. More waste of tax payer dollars.

If they care about this they can simply ban phones in their school districts.

This suit is analogous to banning fedex and ups because kids are addicted to mailing each other scandalous notes. Clearly will fail.

If there’s specific content posted by specific groups that are a concern the school should go after them.

To my knowledge, the reason why free speech is held in such high regard is the idea that only citizens who are well-informed and have equal access to all arguments can make reasonable decisions - which is what a democracy rests on.

If that is the reason though, I'd doubt that speech that deliberately attempts to subvert rational thought and manipulate the audience would fall under that protection.