Using Signal vs Telegram vs WhatsApp
Signal, in contrast, seems to be the most private messaging app and doesn't collect any user data, as per the privacy details highlighted on the App Store. Perhaps unsurprisingly given this fact, Facebook earlier criticised Apple's move to display privacy labels.
The details available on the App Store show that Facebook Messenger is the most acquisitive when it comes to user data collection, followed by WhatsApp. The both apps collect users' purchase history, financial information, location details, contacts, phone number, email address, and usage data, among others.