I'm curious why nobody's created a service like Google Adsense and Adwords using the blockchain at this point? If I had the capital myself I'd be more than happy to actually start said project up provided I also had the time to do it.

Ads could be paid for using cryptocurrencies and admins of websites displaying said ads will gain a portion of the cryptocurrency pile sent their way + a small amount of money from using the viewer's browser for mining.

Suggestion to prevent controversy is to make it so the mining is an opt in "Do you wish to support this site by using 20% of your processing power while here to mine cryptocurrencies? Yes or no?"

Ad supported internet is going to die out, as it likely should, there's better technology than what existed when I was younger, no need for Adsense, but that doesn't mean that ads can't be beneficial in some regards, just needs updated.