The ads are usually targeted based on the user's google searches etc, so they typically won't be shown to anyone that hasn't already been looking for a particular product. I have an adblocker on the main browser I use, but I don't on the secondary browser (which is the one I use for logging in to this ID). I use websites where it's overall more beneficial to not have adblock with this browser, so I see all the third-party advertising when I shop on eBay - usually it's for websites I visit frequently and / or things I looked for and already bought, though. 🤣