Google often gets criticized by publishers for taking their content without asking them first, but the web giant has probably done more to experiment with alternative monetization options for content than any other media entity. On Thursday it starts rolling out a new one called Google Contributor, which is designed to allow web users to pay sites that they visit a monthly fee, and in return see no Google ads when they visit those sites.
https://gigaom.com/2014/11/20/google-launches-contributor-a-crowdfunding-tool-for-publishers/