We search for everything we talk about these days…our location services are always on. The times I’ve noticed this I can usually trace it back to a friend had been searching for something and then we (our phones) were in the same place. Even the guy from the lawsuit with the doctor… his phone knows he was at that doctor and that doctor offers that procedure. Seems possible without listening.
Or more likely: Confirmation bias. I also occasionally get Nigerian memes on IG despite never having searched it. But unlike you I don't have the Nigerian film google search history that would lead me to conclude it was targeted.
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.
This is gaslighting. Even if it’s a coincidence, people have numerous examples of situations where they or anyone with them did not search for a thing. I’m not saying the only possible explanation is that the phone is spying on you - but I’m saying, don’t gaslight people and say “you probably searched about it and forgot”.