Let's turn your question on its head: if using an application fighting to keep users' privacy as high as possible, such as Signal, just as easy as using Whatsapp, why use the latter ?
The premise of your question is obviously flawed: it is not as easy. The precise reason why WA is used is that it's easier, because vastly more people already have it installed.
But anyway, it's just not a priority for a daycare.
Guaranteeing that for example staff don't respond to enquiries about children's health unless it's from the parents is a priority.
But anyway, it's just not a priority for a daycare.
Guaranteeing that for example staff don't respond to enquiries about children's health unless it's from the parents is a priority.