The other case for personalised advertising is when a purchase is almost made. I was recently searching for a toy across Etsy, Ali Express, eBay. I didn't buy

The other case for personalised advertising is when a purchase is almost made. I was recently searching for a toy across Etsy, Ali Express, eBay. I didn't buy it. A day later, I saw 'suggested' purchases on Amazon for the same toy. I boycott Amazon, so I don't often visit their website. I normally block (successfully?) almost all of this advertising, so I find it particularly creepy when I receive it.