Summary: A study by researchers from Data61/CSIRO, UC Berkeley, UNSW Sydney, and UCSI finds that several popular VPN services on Android open up a variety of security holes, including injecting JavaScript for ads and tracking services, traffic redirection to commerce sites, and more. VPNs are useful for encrypting your web traffic or getting around regional restrictions. Most of these VPN services require a subscription, but many also offer free options.
