Why anyone can add me to a group and when I am leave a group they can add again and when we want to do not go to any group what can we do?
I do not think it's better that when someone wants to add us to a group, we accept the request and then add to the group, otherwise it will not add us to the group.
Group chats can be annoying to say the least. Every time someone posts a message you get notified and bothered. And sometimes the messages can be boring and dumb like: "is anyone here?", "is this thing working?", " do you know da way?"; and the best of the BEST: "why so many people are leaving this group?" 😀😀😀.
I totally agree with you adding to groups should be preceded with some kind of "accept/decline" dialogue.