Despite claiming not to, ISPs are still at it, selling your data. Using netflow data, ISPs are able to sell traffic information that can track users across the internet, even through VPN connections. Of course, the end data would have already be identified and unencrypted, so not everything is up for grabs.
Netflow data allows insight on what is occurring on the entire internet as a whole, instead of just a single ISPs network. As such, this is how data can be tracked back to specific users. Thankfully, this means that eavesdroppers will have to parse through huge amounts of data just to make a dent. Moreover, using a VPN is still the best way to keep your information private.
