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Re:Uber discovered they’d been defrauded out of 2/3 of their... by pessimizer on Sunday January 03, 2021 @05:40PM (#25625919)
> The goal was to demonstrate an impact of in-store sales from internet advertising.

So the goal was to advertise advertising. A more scientific goal would be to see if there was an increase of in-store sales from internet advertising. Instead they were looking to design experiments that would show a positive effect, with the goal of giving advertisers a dashboard so they could run those experiments themselves.

Re:Uber discovered they’d been defrauded out of 2/3 of their... by hertzrat on Sunday January 03, 2021 @08:38PM (#25627099)
To let those advertisers do the experiments themselves, and to relate the campaign to in store sales, would require Facebook and google to share a ton lot of internet-user tracking data
Re:Uber discovered they’d been defrauded out of 2/3 of their... by webmaven on Tuesday January 05, 2021 @12:00PM (#25647590)
> To let those advertisers do the experiments themselves, and to relate the campaign to in store sales, would require Facebook and google to share a ton lot of internet-user tracking data

I think you are misinterpreting what "do the experiments themselves" implies.

Certainly there is a JOIN with Google's or FB's data, but it can still happen entirely in a hosted sandbox with no data sharing necessary.