My sister has one so she can check in her dogs when she's out. She usually works from home but sometimes she has to visit other sites.
If she's away overnight I'll go and stay to look after them, but occasionally she'll ring and I'll tell her that one of them has been sitting on my knee or something, and she'll tell me that she knows, she can see us on the dog cam. I find this really annoying that she can look whenever she wants.
I can understand if the dogs are on their own, but they're not.