The big player in voice computing right now is Amazon, which sells the Amazon Echo speaker as well as a slew of new and coming products with the Alexa voice assistant built in. Amazon doesn’t need to make money from search ads. Instead, it can use Alexa as a way to encourage users to buy more stuff from Amazon and sign up for services like Amazon Prime.
Google makes its own voice-enabled gadgets to compete with the Echo, called the Home. The problem is that Google can sell plenty of Home devices, but they won’t make up for the bigger loss of ad revenue if voice really catches on and the world moves away from screens. Google needs to figure out a new type of ad or a new business model.
Source: Google CEO Sundar Pichai answers concerns over monetizing voice search – Business Insider