That's not what's being suggested in this article, nobody is injecting beacons into traffic that passes through a VPN server, however most providers are adverti

That's not what's being suggested in this article, nobody is injecting beacons into traffic that passes through a VPN server, however most providers are advertising themselves as more than just a pipe that you funnel your data through, which gives you a different IP on the other end. They market themselves as complete solutions to being private and anonymous online by using words like "total privacy", "complete privacy", "fully protected" when promoting their products. You being a more tech savvy users knows that this is not the case, however a less knowledgeable person will mistake these services for what they claim to be, which they are not. They make these claims, while exposing their own users to the same trackers they claim to protect against.