I watched a Nigerian film on the seat back display on the plane the other day. I looked it up on my laptop when I got home because I didn't finish it.
The next day in my Instagram explore page I had a Nigerian meme...
Yes, I get it -- could be frequency illusion or some IP address/cookie shenanigans. Still feels weird.
Put another way, if you googled a Swedish film then saw Swedish memes you would think that was targeted. Then upon viewing the Nigerian memes you would have attributed it to a random video rather than anything targeted.
That is the real mechanism for triggering the ads and memes, not that “your phone is listening to you.”
At least feel creepy about the real cause and not some imagined monster under the bed.