Re: [w3ctag/design-reviews] Private Aggregation API (Issue #846)

We appreciate you bringing this to us. We see that Chromium has already shipped this API, so this comment primarily applies to your efforts to bring it to other browsers. We [understand this to be a generalization](https://github.com/patcg/private-measurement/issues/22#issuecomment-1734280125) of the three advertising attribution proposals that the PAT[CW]G is working to unify, and we think it'll be most productive to finish that work before refining this generalization.

We recognize that it's usually beneficial to generalize features, but when those features come with privacy risks, we think it's important to balance those risks against the value of the additional use cases. This explainer only identifies two additional use cases. One of these is Protected Audience, about which the TAG has already expressed concerns (#723). We did not find the building of market demographics across sites to be sufficiently compelling to justify this whole generalization.

Given that the short term focus should be on finishing the advertising API, we're going to decline this review. However, if more use cases turn up for the generalization, we'd be open to looking at it again.

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