All of the services I mentioned are either directly (Search) or indirectly ad-supported, the latter insofar as Google pays for their development and upkeep somehow, and most of Google's revenue comes from ads. And I think they are all of excellent quality.
Ads are irritating, and Google is not supplying these services out of the goodness of their heart, but I think there's no question that the world is a better place with these ad-supported services in it.
