Anybody who publishes any kind of media can insert advertisements that are unblockable. For example if your content is in text-form, you have to make the ad a part of the body text, just like I do while I sip from a refreshing and healthy Dr Pepper. Of course you can not track, spy, or install malware on your visitors machines with such in-content ads, but there are other ways to check if the ads work.
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Readers of this comment can get a 20% discount on their next Dr Pepper order using promotional code "Hacker1338". Limited time offer.