Also, I’m having a tough time understanding how hackers would obtain PII from anonymous data.
If anyone clicks through on an ad, the website that it takes them to can use Pixel Tracking to get their IP address and be able to identify the person from that. Or from spamming out to email addresses and getting information from all who observe the message whether they click or not.
The below says that Pixel Tracking used in an ad image is enough to get the IP address, even without the user clicking.
Tech 101: What is a Tracking Pixel?
https://skillcrush.com/2012/07/19/tracking-pixel/
When a tracking pixel is embedded into the HTML code of a website, an online advertisement, or a marketing email, each time a user loads that site, ad, or email in their web browser they also load the pixel tag. This event triggers a request to the web server where the tracking pixel is hosted. The server then sends the pixel tag to the user’s unique IP address (a string of numbers that identifies each machine connected to a computer network) and that address is logged by the web server. Website owners, authors of email marketing campaigns, or advertisers responsible for the tracking pixel can then periodically analyze server logs and understand how many unique views their content is receiving.
Still not sure if Google’s pending changes would affect this, but for those who value privacy it’s a good reason to turn off automatic image loading in your email and Pixel Tracking on your mobile and TV devices.
From the TTD privacy policy statement:
OPTING OUT ON IOS DEVICES SUCH AS IPHONES, IPADS OR IPODS
If you have an Apple device, you can opt out of our IBA services by updating to iOS 6.0 or higher, and setting Limit Ad Tracking to ‘ON’. You can do this by clicking on Settings → General → About → Advertising and toggling Limit Ad Tracking to ‘ON’. Our systems are designed to respect your choice and not use information to provide IBA when this setting is ON. Again, you should consult Apple’s support web pages and instructions for the most current applicable settings.
OPTING OUT ON ANDROID DEVICES
If you have an Android device and would like to opt out of our IBA services, you may do this as follows:
1. Open the Google Settings app on your device
2. Select Personal info & privacy à Ads settings à Manage Ad Settings
3. Turn to “off” the “Ads based on your interests” option.
Our systems are likewise designed to respect these choices transmitted by your Android device. Again, however, please consult Google’s settings and instructions for the most current settings information.
Please note that these settings do not block ads, but rather will not base ads on your interests.
For Apple devices, use:
https://support.apple.com/bg-bg/HT202074
Enjoy,
Brian