> Bidstream data, short for bidstream location data, is any data connected to a publisher’s bid request. This includes data on the website or app, the ad format, as well as the visitor’s device type and their IP address.
>This information is passed to the advertiser in order to allow them to decide whether to bid for the ad unit via real-time bidding (RTB).
I had no idea this data was getting shared with so many people before the ads were even shown. All the more reason to ad block / dns ad block.