> This API collates information about people from multiple web origins, which could be a significant risk to their privacy. To manage this risk, the information that is gathered is aggregated using an aggregation service that is trusted by the user-agent to perform aggregation within strict limits. Noise is added to the aggregates produced by this service to provide differential privacy. Websites may select an aggregation service from the list of approved aggregation services provided by the user-agent.

Now that Google have back-tracked on removing 3rd-party cookies[1] I can't help but think any attempts to standardise tracking APIs is only going to add more data to the mix. This seems like yet another source to abuse.

[1] https://privacysandbox.com/news/privacy-sandbox-next-steps/