Not sure how they are going to charge it. But, that's weird.
Ahhhh......... I see. Free for IE9 and other browsers. They charges iOS and Android applications. So, it is easily tracked through Apple Store and Android Store.
Except that's not what it said.
"Applications that make less than $50,000 in revenues will remain free of any royalties, as will any use of the premium features in applications packaged with Adobe AIR, including mobile applications for iOS and Android."