Possible Bug in WhatsApp May Provide Others with Access to All Your Messages Messages restored in plain text on new phone numbers January 11, 2019 https://news.softpedia.com/news/pos...with-access-to-all-your-messages-524516.shtml
Oops. See, that's (one reason) why it's dangerous to tie messaging app accounts to phone numbers. Nuking history after N days inactivity isn't reliable. Users may just go inactive for N days, and then be screwed when history is gone. And whatever N you pick for the inactivity reset, there's the chance that the phone number will change hands before then. Also, it's generally a privacy fail to tie messaging app accounts to phone numbers.
Does WhatsApp Has A Privacy Bug That Could Expose Your Messages? January 11, 2019 https://thehackernews.com/2019/01/whatsapp-privacy-chats.html