Granny pics and chat free no reg or sign in
Treat your children, and maybe even set up a server with them. That means that all you have to do isn't make sure they don't reply to or click on links from strangers and you can even chose to scan messages received for bad language/inappropriate content and control who can add them as a friend.
If someone made that decision to do that, then that's their own fault.
If your child has this for gaming they can be added to chats.
Be vigilant about checking this app if you allow it.
As a communication platform, I think that Discord is quite good.
It allows people to chat and screen share very easily.