What happened to the Privacy Budget?

[Dobbo1]

I can see the repo is now archived and Google site says it’s no longer under consideration but I can find no announcement as to why it was dropped or what next.

[BrianLefler]

The Privacy Budget was found not feasible, at least right now. The proposal's objective was to set a hard limit on how much information websites could collect about users and that required solving two hard challenges: 1) Dynamically calculating the amount of information APIs are revealing about a user, 2) Enforcing a limit before a user becomes individually identifiable.

We ran testing on the proposal but couldn't find a way to implement without causing problems for both websites and users. I don't have a detailed analysis to share, but you can find an external analysis by Eric Rescorla here which I find pretty accurate about the technical difficulties. Google did publish a paper on calculating the information revealed by APIs, Assessing Web Fingerprinting Risk, for the 2024 ACM Web Conference.

There is no specific "what next" to report.