Interesting. The cost of providing web services keeps decreasing, but this isn't being passed along to the consumer in the form of fewer ads. With the "contributor" model, pay sites will, over time, be able to undercut ad-supported sites on price.

That's probably not what Google has in mind, though. This presumably requires that the user have a Google account and be logged into Google to get ad blocking. So Google gets to snoop on the user and sell the information they collect.