> 5) message each other about something. However you need to source your ideas from something offline, like a book from a thrift store or the like. maybe an old magazine. open a page, pick the first thing your finger lands on. this will eliminate the "I heard about x" or "i'm in the mood for y"
Wait... If WhatsApp is really E2EE encrypted, why would any of the other steps be necessary? Dude and his wife can simply pick at page at random from a magazine in a store, never search anything online about it, start talking about it using WhatsApp as if it was something of great interest to them. If they start getting related ads, obviously something shady is going on. There's no need for new phones / new GMail accounts / etc.
> If WhatsApp is really E2EE encrypted, why would any of the other steps be necessary?
because you need to eliminate the chance of profiling by any other means.
Using the same phone as before means that the pre-existing profiles exist, which means that the relationship is already inferred. Because its trivially easy to track people, you need to eliminate all other variables.
Wait... If WhatsApp is really E2EE encrypted, why would any of the other steps be necessary? Dude and his wife can simply pick at page at random from a magazine in a store, never search anything online about it, start talking about it using WhatsApp as if it was something of great interest to them. If they start getting related ads, obviously something shady is going on. There's no need for new phones / new GMail accounts / etc.