He says that when you click on an affiliate link, a cookie gets stored on your browser that lasts for 30 days, saying that the source should get the commission for your purchase. Honey has a popup in checkout, even when there are no codes, with a big “Got It” button to close the popup. Clicking the Got It button replaces the old cookie with a Honey cookie, giving the commission from your purchase to them instead of your source.

I’ve slept since I watched and am not great with tech, but iirc the link with the affiliate code when clicked takes you to the site. Then honey has a pop up that, when clicked, replaces the link with their own, swiping the commission. Hope that makes sense - most people likely would not catch it. The Linus tech tips was used as an example of even a tech channel with lots of employees taking quite a while to notice themselves, and even when they did, it wasn’t quite conclusive for some reason?

Another thing the video touched on is that honey would claim to search for coupons but often opt to show what the partnered companies want. So, could be there’s a coupon for 50% but they only show 10%.

I assume it looks for affiliate links and replaces the original with it’s own affiliate ID.