when someone adds you in Whatsapp group without your permission that
we can assume that Whatapp may get too many feedback for the same, so now the application is going to add one more feature in privacy setting.
How to change the WhatsApp group settings
The feature will be available under ‘Privacy’ in the ‘Account’ section. Here, users can choose to alter the settings for the WhatsApp groups to: “Nobody,” “My Contacts,” or “Everyone.”
So here’s how this works, if you choose “Nobody increase then for every group that wants to add you, you will have to accept every request by them.