Earlier quoted context omitted.
Yes. But the whatsapp groups are impossible to move. I created the same group on signal. Nothing, two people move. Even in my office, a technocratic environment for sure... People won't move. We need a stronger motivator to move them or we need to make moving "seamless".
I chuckled when our daycare had a lengthy discussion about data privacy and, twenty minutes later, asked every parent to join the WA group.
Facebook know who is in the group and what they post but none of it is necessarily confidential information.
On the other hand, the daycare as part of their operations know lots of details of your children's development, health issues, allergies, mental health, educational attainment and special needs. They know if you are getting divorced, who has custody, if there are dangerous people in the child's life and so on.
Is keeping this private really in the same ballpark as choosing to have a WA group or not?