Not to be confused with oyster knife the shellfish edger.
as fortune put it
Google's 'Selfish Ledger' Collects Your Data to Change Society | Fortune
A couple of years ago, Alphabet’s X “moonshot factory” conjured up a concept that describes how total and absolute data collection could be used to shape the decisions you make. And now a video about that concept has leaked online.
The video was obtained and published on Thursday by The Verge. It describes a so-called “Selfish Ledger” that would collect all of your data, including actions you make on your phone, preference settings, and decisions you make, and not just keep it there for future evaluation. Instead, the ledger, which would be designed and managed by Google, would interpret that information and guide you down a path towards reaching a goal, or on a broader scale, doing your part to help solve poverty or other societal problems.
In one example, the video describes how the ledger would ask you to create a life goal. It would then tell you what kind of activities to engage in to achieve that goal. So, for instance, if you want to lose weight, the ledger would see that you’re shopping for food on your phone and direct you to buy a healthier option. The video even suggests that some of the recommendations would “reflect Google’s values as an organization” to get you to reduce your carbon footprint.