Google/DoubleClick has been using Swiffy to convert their customers' Flash ads to non-Flash HTML/SVG for mobile websites. It would be easy to use Swiffy ads on desktop, too. If other ad networks can't convert Flash ads, then ad agencies that want to continue use their Flash toolchain will move to Google/Doubleclick's ad network (to get Swiffy) thanks to a change in Google's own browser (which also happens to be the world's most popular browser).