Retailers hope to gain access to our homes to deliver purchases—and also to learn more about what we’re likely to buy next. Now affordable, Google’s various home automation systems make it easy for you to shop online and to take while traveling.

Workers from both Amazon.com and Walmart.com will deliver packages indoors and even stock your refrigerator with groceries, and to allay fears of theft, those workers wear cameras.

The problem? Amazon and Walmart will store video footage of the delivery, allowing them to develop computer vision analytics and other processes to gain insights from the millions of hours of video collected.