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.
I suspect that's the impact of other burners also shopping, generating a good list of "people who bought A and B also bought C, D, E...". As soon as you hit A & B, you trigger the rest, while the average person doesn't.
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.