i rember when i tried to convince my high school friends to install signal. not even stop using whatsapp, just install signal. most of them never did, despite my pleading.
the solution was for me to go to a different university once i finshed highschool, find new friends who were cooler and leave the group chat and uninstall whatsapp.
I don't care. I've done all I am able to do. All my data that is being shared now is something I cannot prevent, something I don't know about or something I am willing to pay the privacy for.