https://thenextweb.com/contributors/2018/05/28/be-cautious-free-vpns-are-selling-your-data-to-3rd-parties/

It isn’t unusual to find companies using deceptive practices when trying to market and grow their brands. One niche where this is very rife is in the VPN industry. It was recently revealed that contrary to claims on their websites, 26 of the 117 most popular VPN services log user data despite touting contrary claims in their marketing. That revelation will seem tame compared to findings on how free VPNs operate: many openly and brazenly share/sell user data.

Now that new GDPR laws are enforceable, more attention is being focused on how organizations use user data for marketing purposes. When it comes to data abuse, however, VPN service providers — particularly free VPN services — are the biggest culprits.