If you stare at one long enough, it’ll attack.
Screen-based teleprompters are great. They allow you to read a script while looking at, or at least appearing to look at, the camera.
But don’t fall in love with your teleprompter so much that you forget to break eye contact every once in a while to do something miscellaneous (glance at the wall, shuffle papers, stare into space, whatever).
If you stare at the teleprompter for more than about 20 seconds at a time, your audience may start perceiving in you hostility and aggressiveness that don’t actually exist.