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There is no such thing as an unintrusive advertisement.
I'd be happy with a static image, hosted by the website which when clicked takes you to the advertiser's website
http://www.milliondollarhomepage.com/
(recommend not actually clicking any links)
I didn't mind the static ones (within reason), websites need to pay their rent. And not everything can sell something.
But even those have tracking and gross injection code now.
Even emails have tracking pixels at this point. Like, I route all of my email through a client that blocks all outside media without asking lol
In the long ago if a site needed advertising it was a small banner at the top of the page, and often hosted by the site itself with gasp an actual relationship with the advertisers or sponsors.