That would imply ethical (actual) use of this tag. I cannot thing that any advertiser would ad this, just as they ignore the "Do not track". I fear that we will never we able to rely on the ad-makers honesty, as the hunt for the bottom-line never ends. It looks like this will be a war we will continue fighting with AdB+, NoScript, uBlock(s), hosts, and other tools.

It has been a cat and mouse game. The tech changes, but the game goes on.