> If a shopper clicks on an Etsy-funded ad featuring one of your listings on Google, Facebook, Instagram, Pinterest, and Bing and makes one or more purchases from your shop within 30 days, those sales will be attributed to Etsy’s advertising and you’ll be charged an advertising fee on the total value of that order. This kind of stuff is why tracking is so pervasive. Etsy is relying on being able to uniquely track a s…
As an advertiser, in general you need to watch out for things like cookie bombing where a network carpet bombs a large number of people as cheaply as possible in hopes of tagging your customers who would have bought any way and inflating their performance.
The other concern is retargeting. As an advertiser, I'm incentivized to run incrementality tests on things like retargeting that tends to cannibalize attribution of conversions. This helps ensure I'm not wasting impressions on people who would have purchased anyway.
From what you posted, it sounds like Etsy may actually have an incentive to explore these tactics because they control all the data, transparency on targeting and tracking, and what products they feature.
So in a hypothetical (not saying this is happening), if they need to dial up revenue, they could filter for high priced items that sell well on their own (regardless of the margins of the seller), retarget anyone they can who visited the seller's page before, and claim credit for people who may have bought without it.
All of that said, the percentage they are taking from this alone is not much and may not actually offset the media cost in all cases to deliver a positive ROAS. But I would be surprised if they haven't already tested this and run those numbers.