The ExpressVPN Digital Security Lab has identified location tracker SDKs in 450 different apps that have been downloaded at least 1.7 billion times. These 450 apps belong to a wider range of categories like travel, tourism, food apps, health, and fitness. Recently, WhatsApp got embroiled in a huge controversy over its privacy policies, and that eventually led to a major shift in its user base to apps like Signal and Telegram.
App Lock adds another layer of security to private messages. The optional feature gives users "confidence to know that if a friend or family member needs to borrow your phone, they won't be able to access your chats". App Lock, present in the new Privacy settings section, will use device's privacy settings like fingerprint or face authentication to unlock the Messenger app.