I don’t use any social media or shopping apps. I went to the store yesterday and bought a particular item. Today I see ads for that item when I’ve never seen ads for that item before. how exactly my phone is letting advertisers know what I bought?
As others said – a google search for that item is enough for it to be registered.
It could also be the algorithm calculating though. If it know when you bought a bottle of shampoo for example it can roughly calculate when you need a new one and send you ads then.
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