Contributor was a micro-payments subscription thing were you could buy a subscription and actively participate in the regular ad-exchanges. The idea was that you could support websites by outbidding crappy advertising on Google’s platform and see pictures of cats (or whitespace) instead. It doesn’t take much money to outbid just about every advertising you’d see in a normal month.
https://www.ctrl.blog/entry/google-contributor.html
They’ve repurposed it as an “ad removal pass” service were you pay way more money per month per website that you want to remove ads on. It’s limited to large publishers only. https://www.ctrl.blog/entry/google-contributor-twopointoh.ht...