Recently Amazon removed the ability for Android app developers from earning money based on popularity and use.Previously app developers could release a free app that had no advertising and still earn money. The money earnt was based on usage of the app. The more it was used the more money that could be earned.
Well, that bad news for app developers has turned into good news for skill developers. Amazon has extended an incentive for skill developers. Previously skill developers could earn money if they posted a skill in 1 of the following categories: