Here is a thorough analysis by Alex Kleber - https://privacyis1st.medium.com/the-dark-side-of-the-mac-app...
Yes, there are multiple scam apps
Yes, there are multiple scam apps
For example, one of the apps from the article claims to use 'GPT-4' and they actually do call the OpenAI API, but use the GPT-3.5 model.
Another app that also claims to use GPT-4, actually uses a different (self-hosted?) LLM.
In my opinion, this is a scam - a fraudulent attempt to make a quick profit.