It has a microphone right there, so why wouldn’t it be sending our voices to Google headquarters or wherever so they can send me an ad? What other explanation is there?

She made a search on wifi for a cordless dremel. Ad companies saw “this IP is searching for cordless dremels we should give ads there”

Author joins same wifi network and goes to a page served by said ad company (or company in general like amazon). Gets ad for dremel.