This is a good question, many years ago I had used this modified version of WhatsApp, I think it is great because it has hundreds of functions that the common WhatsApp does not have, but I have never used it again because at that time the same thing that you say had happened to me. They had blocked that version of GB WhatsApp and I had to install common WhatsApp, losing all the chats, since then I have not used the modified version again, but from what you know today it is a bad option since they are closing it constantly