I've seen relevant ads beside search results on Google, but that doesn't really take a lot of magic to figure out that when I search for "Aeropress", I'm interested in coffee.

Ads in podcasts have been somewhat effective as well. I use Blue Apron, I like Audible, I've checked out Squarespace, I bought a Casper dog bed. AFAIK, none of the podcasts know anything about me, but they do know generally who their audience is.