You're getting some downvotes, but yes, lol. I mean I'm not sure there's never any surreptitious hot mic eavesdropping going on, but people definitely often assume so when there's a more parsimonious explanation, e.g.:

Most peoples' ads are targeted based on more mundane technology, and they see hundreds of ads per day, so if even 1% of their ads overlap with something that they were just talking about, they'll still be fairly likely to see a spooky "I was just talking about that!" ad relatively frequently. Not to mention that they're likely to be thinking about a thing because their platforms are also proactively marketing that thing to them. Just pareidolia, no eavesdropping necessary.

Doesn't mean eavesdropping isn't happening-- Just means it doesn't need to be happening for that effect to occur.