Yeah, it's one of the things I hate most about the ad ecosystem. The pro-ad argument is "they give the little guy a kick at the can", but that's tremendous bullshit. Try an example: Turn off adblock and search "Lejiled Wallet" (a very small French company which makes nice leather wallets). You'll get ads for much bigger companies (Fossil and Belroy) in the sidebar, and those ads will follow you all around the internet for months. https://i.imgur.com/lAaAdGM.png