Stupid question, but can content display netwo…

If display or promotional/text ads are always popping up whenever you make a search, what is to stop the CDNs from stockpiling this information as well? Does this actually occur on some of the lesser used search engines like Ask or Yahoo or whatever? Google?

I’ll get a bit more specific in my questions..

Those text/promotional ads you see at the top of search results. Are they part of the CDN so third parties can see the search?

I kind of feel like ads were never on image/video parts of search engines that I recall, but I’m not sure. Is it normal to not include them on these parts?

Thanks

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