Why would I want to congratulate them?

Apple are making it extremely easy for anyone to track you without your knowledge. If you're then the victim of a crime due to that as far as I'm concerned apple is complicit.

I can see this harming victims of domestic violence.

There are many other tracking devices available. This is the only one that notifies the target. If one of those other devices had been used then this lady would have never known she was being tracked.