It's far more likely in this scenario, there will be little confusion between the generic text ad and the first organic link that clearly has the seller's name in it.
Even if they don't, it still falls into a similar trap. A few weeks prior (when I was still looking for cheaper alternatives), I mentioned off-hand that I've found one option, and it's on Etsy. Did she Google "[generic term] + Etsy" (I only found one seller, so it's tantamount to searching the seller's name)? I've no idea, but if she did, they're probably taking 12%.
It's not easy to automate, or to build a model that demonstrates that targeting this low-level will have a positive ROI. Advertising is a fickle game, and I don't see this being successful without building it on a broad program that allocates spend by some segmentation of their sales (e.g. product category).
I'm not quite sure why you feel it isn't but I'd like to better understand your perspective.
Everyone wants to pretend that seller's are victims, but let's not pretend that any of them are any more loyal to Etsy than Etsy is to them. How many seller's are in multiple marketplaces? All of which charge much more than what Etsy has been charging for the amount of free traffic they're providing.
The marketplace market has evolved. You can sell your products on Amazon, Etsy, Walmart, NewEgg, Rakuten, and eBay at the same time. An entire industry of SaaS tools has evolved to manage this. Etsy has been way behind the in what they're charging sellers, and none of the seller's benefit if Etsy goes under.
This is what other marketplaces charge, for ALL orders. Providing the same service as Etsy.
Amazon: 6-20% (15% average)
NewEgg: 8-15%
Walmart: 6-15%
eBay: 10%+