https://www.theguardian.com/technology/2018/jan/26/google-reminder-ads-mute-privacy-tool

New settings will allow users to hide reminder ads on a case-by-case basis, giving more control over muted adverts across devices

Google is rolling out a new tool that will stop so-called reminder ads from following you around the internet, typically used to try to get users to come back after virtual window shopping.