Is that something that actually happens? Do people say "let's run this ad on teenvogue.com"? Don't websites (especially businesses of the scale of WSJ/vogue/etc) get their ads from ad networks?
It's easy in current ad targeting setups to limit an ad to running on particular sites or to prohibit an ad from running on certain sites.
If someone were to run an ad and configure the campaign such that it appeared on the Wall Street Journal website and not the Teen Vogue website, would this action have any different moral or legal character from deciding to run a print at in the Wall Street Journal instead of Teen Vogue?