Just noticed that an item that was heavily Google searched on one device in my home was now showing up as an advertisement on another device that was using Internet Explorer. This device is purely used for work and that has never once been used for searching for this item or anything remotely related to it. I find this very disturbing, albeit highly coincidental, and I cannot draw any other conclusion (additionally, no other devices pair or interface with the work device in question).
<a href="https://ads.google.com/intl/en_uk/home/resources/retargeting-ads/" rel="nofollow">https://ads.google.com/intl/en_uk/home/resources/retargeting...</a><p>Your ISP can see your DNS queries at least, and <i>might</i> sell that data. But they probably don't know which specific items you searched for because that data is encrypted between you and Google.
Is it possible that the ads are served by Google, and that Google infers your devices belong to the same household because they share the same IP address?