https://techcrunch.com/2017/12/15/alexa-skills-top-25000-in-the-u-s-as-new-launches-slow/

Amazon this week officially launched the first skills for Alexa offering premium content that customers can purchase while using the voice apps – a move the company had announced was in the works back in November. The ability for developers to generate money from their skills comes at an opportune time, as it turns out, given that new data indicates the rate of skill growth is beginning to slow.

According to a third-party report today from Voicebot, it took 124 days to rise from 5,000 to 10,000 skills in the U.S., 103 days to go from 10,000 to 15,000 skills, then just 63 days to go from 15,000 to 20,000 skills. However, the rise from 20,000 to 25,000 skills – a new milestone for U.S. skills, in fact – has since slowed back down to 103 days. *