Once you've downloaded the "Facebook Research" VPN (sometimes called the "Project Atlas"), the app prompts you to "install our root certificate". In this way, you give Facebook almost unlimited access to your mobile device. In return, Facebook only pays you $ 20 (in the form of gift cards) per month. A well-known fact that VPN is designed to protect your privacy and allow you to stay online anonymously. The great example of such apps is
https://www.vpnunlimitedapp.com/en, but isn't the Facebook Research app. Facebook app does the exact opposite. The Facebook Research VPN reportedly collects data about: