Is there such a thing as an entirely passive online ad? Any clickable ad at least knows which site you were on when you clicked; TV advertisers don't know what

Is there such a thing as an entirely passive online ad? Any clickable ad at least knows which site you were on when you clicked; TV advertisers don't know what I was watching when I saw their ad. That aside, the crucial difference is still this: TV ads cannot be removed. If they could be, they would be. Since online ads can be removed, and since doing so provides an enhanced user experience, and since (passive or not) online advertising facilitates the gross pollution of the internet by financing endless numbers of splog, malware and other content-free junk sites, that nobody would ever pay for directly, why not block them?