That's neat. I think I'd seen that but forgotten about it since it has remained mostly irrelevant.
I'm excited about the idea, but I'm also pretty skeptical of this infrastructure even being run by Google. I'd rather it be open source. The project could fund itself through the same donations it enables for others, which is more concrete of a fundamental than a lot of other projects.
is a way to promote more ads by excluding sites that respect their audience and don't show ads. You have to be already showing Google ads in order to have Contributor as a way to turn them off. So, the incentive pushes toward net increase in ads.