https://phys.org/news/2018-06-alexa-breakfast-amazon-echo-hotels.html

It is another way for Amazon to sell its voice assistant and devices to businesses and get Alexa in front of more customers. Amazon already sells a version of Alexa for workplaces, and has struck deals to place Alexa in cars and refrigerators. Alexa has become an important part of Amazon's business because it keeps users attached to Amazon services, such as music streaming.

Amazon said data from hotel guests will be deleted daily, and Marriott said those who don't want an Echo device in their room can ask to have it removed.