WhatsAp uses end-to-end encryption, which means that only you and the person you are communicating with can read the contents, and no one else, not even WhatsApp. Maybe that's why you did not feel the invasion, and maybe there was no reason for anyone to invade your life)

Each person is not immune from situations when the data of the hacked correspondence will be used against him. I use the "Signal" messenger. So far, no problems.