https://www.cnet.com/news/google-assistant-expands-to-a-billion-devices-and-80-countries/

It turns out 2018 was a productive year for Google in the smart home as well, with the company adding a number of useful features to the Assistant such as touch controls in the app and on smart displays. Google will try to build on this momentum at CES this week with a huge expected presence. 

Google's announcement comes as its rivalry with Amazon continues to heat up. Last week, the e-commerce giant said 100 million Alexa-enabled devices have been sold so far. Both of the figures by Amazon and Google don't tell the whole story, though. For example, Google's 1 billion Assistant devices also include Android phones, which come with the software already installed by default.