I think it's interesting when a bunch of people chime in and say "Hey, yeah, I had some crazy thing happen to me, I'm in tech and understand how this stuff works, and there's a very small to zero chance this happened through some other parallel construction by the tech company, they just straight up listened to my conversation and showed me an ad".
This is what kicks off a handful of you to go packet sniffing and write up a blog post looking for this behavior. So yes, evidence is welcome but it doesn't seem like we are quite there yet.