We talked about cell phones and security cameras spying on us. And a little bit about ransomware.
This story from the Dec. 12, 2019 Washington Post about a family who bought a Ring camera and endured somebody on the other side of the internet taunting their eight-year-old daughter should be an eye-opener for anyone considering putting one of these things in their home. Here is a PDF in case the link above goes bad.
Also take a look at my blog posts, here and here about buying and operating smart-home devices.