How to profit from creating eBay Buying Guides and "collections"?

I noticed that a very prominent automotive blogger posts EVERYTHING he does on eBay Buying Guides and then has a link to his collections. He has hundreds of collections with different items from different sellers.

I am guessing he is utilizing some kind of affiliate program. I looked into it and cannot find anything.

Does anyone know how he is able to monetize this and what affiliate program is being used?

Thanks!

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