There are other posibilities Jack. When I made a dentist appointment in person without any existing phone, in the following days a plethora of dentist ads hit my computer. The dentist office probably entered information for insurance purposes or other reason on the web.

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US police collaborated with Australia to sell over the web a FAKR encryption app that attracted criminals to buy and use. The police sat back for a year and watched all the messages until they busted some international crime rings.

Some AI can predict with minimal information such as age and name to a high predictbility rate. Then there is coincidence.