I mean, I bought a coffee table through Amazon a few months ago. After buying the table, for several weeks it kept showing me coffee table recommendations. I would think Amazon would be smart enough to try and sell other living room furniture or things to put atop the coffee table I just bought, rather than trying to sell me more coffee tables.
Every year around burning man time it "notices" that I'm buying supplies for burning man, and starts recommending me things like baby wipes, which are completely unrelated (naively) to things like lag screws, rebar pullers, etc.
Try buying lag screws, rebar pullers, etc. in 6 months and see if it recommends your baby wipes.
Their catalog is getting so bad that I can't even find things when I know exactly what I want.
Their achilles heal though continues to be browsability and searching. It is obviously a great place to go if you know exactly what you want, but continues to be a poor experience if you are browsing for an item or don't know what you want. There continues to be duplicate listings for the same items (some listed by 1st party and some by 3rd party), and it is very tough to browse items. Once they actually figure this out and implement, that's when this will really become game over (at least domestically)