Have you gone and disabled the backup options for every contact you chat with, in every personal and group chat? They back it up. Your chats are included in th

Have you gone and disabled the backup options for every contact you chat with, in every personal and group chat? They back it up. Your chats are included in the backups that happens to their Google accounts. WhatsApp pushes the drive backups frequently. Every single person I chat with has enabled it. I've checked.