- From: Charlie Harrison via GitHub <sysbot+gh@w3.org>
- Date: Thu, 28 Apr 2022 14:40:27 +0000
- To: public-patcg@w3.org
Thank you @eriktaubeneck and @benjaminsavage that indeed resolves the concern. I was assuming we could have separate calls like:
```javascript
generateSourceEvent("fb1.com");
generateSourceEvent("fb2.com");
```
And having the match keys unioned during attribution would be optional, not required. If that's not possible then it effectively means that sites are forced into "identity union" model when working with multiple identity providers / third parties which is an interesting consequence. You could imagine ad-tech to ad-tech abuse where one ad-tech starts using a uniform match key across all users to mess up another ad-tech's measurement on the same site. Would need to think more if this is in any way a practical concern.
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