I don't see an issue with copying your app if they copy what your app does.

You didn't invent the need for this info, you were just the first one to put it on the app store.

Copying your story and (I assume) graphics is definitely a reason to be angry. Like others have said, look into the possibility of DCMA takedowns.

Yeah, the write up for many essentially mine rewritten by an LLM. The terminology is too parallel for coincidence.