Your Roomba may be vacuuming up more than you think.

High-end models of Roomba, iRobot’s robotic vacuum, collect data as they clean, identifying the locations of your walls and furniture. This helps them avoid crashing into your couch, but it also creates a map of your home that iRobot is considering selling to Amazon, Apple or Google.
https://www.nytimes.com/2017/07/25/technology/roomba-irobot-data-privacy.html