Create a web page of various recommendations, send it to a specific friend whose household regularly makes purchases on Amazon. Unsuspecting friend clicks on affiliate link, now you know all things they buy in the next 24 hours.

Works anywhere else where the audience can be identified, and click frequency is low.

Oh, no definitely not. Nope. There's no way that a company can see that you've purchased Some Things within the past 24 hours and definitely can't correlate those purchases with receipts. Nope that's not a thing. Definitely not. No way at all. Especially since companies aren't owned by parent companies. That would totally be impossible.

/s

Correct. As the affiliate blog you see nothing involving receipts or personal info for purchasers. It’s just a jumble of all your referral purchases

Unrelated but on Amazon is it possible to get order details if you have an order ID? You used to be able to scrape email for details but now you just get the ID itself.