Free VPN Risk Index: Android Apps

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We created the risk index by testing the 150 most popular free VPN apps in the official Google Play store. More than 25% failed to protect user privacy due to DNS leaks. We also found 85% featured questionable permissions or functions buried in their source code that could potentially be used to spy on users. Our tests also revealed a laundry list of other security flaws and performance issues.

• Tested: 150 free VPN apps with over 260M installs from Google Play store
  
• 25% fail to protect user privacy due to DNS and other leaks
  
• 85% feature excessive permissions or functions with potential for privacy abuses
  
• Long list of other security flaws and performance issues
  

Source: https://www.top10vpn.com/free-vpn-androi...isk-index/