Along with the camera on your phone, the camera in your laptop and any other WiFi capable device that has a camera. I always have a piece of paper taped over my laptop camera for reasons exactly like this, whenever I’m getting changed etc and have the laptop on the bed
This is exactly why I will never own a Wi-Fi controlled monitor.
There's been loads of these stories in the news. There was a video a few months ago where you could hear a man talking to a little girl in her room in America. Luckily she shouted her mum but he was saying how he was Santa Claus and she should be his friend etc. It's disgusting