300 companies just read this page. Every page load. #shorts #adtech #privacy

追加: 2026-05-23

[00:00:00]I.

[00:00:00]And here is the part that breaks people.

[00:00:03]That JSON document is not sent to one buyer.

[00:00:06]It's broadcast to between 50 and several hundred ad exchanges and bidders simultaneously on every single ad impression.

[00:00:14]The bidders that don't win the auction still receive and store your data.

[00:00:19]Loading one page can mean 300 companies just received your location, your device ID, and the fact that you were reading about, say, a specific health condition.

[00:00:29]Johnny Ryan, a researcher at the Irish Council for Civil Liberties, captured real RTB streams in 2022.

[00:00:36]He documented bid requests broadcasting the fact that specific users were reading content about HIV, substance abuse, child abuse support, and political dissent to hundreds of companies in real time.

[00:00:50]Many of those companies retain bid data for months.

[00:00:54]Some sell it onward.

[00:00:56]There is no technical mechanism to recall a bid request once it's been broadcast.