Suspicious
The app server being full for conversion vs converting locally makes me think the author is storing songs to steal them, launder them through an AI song editor tool, publish them as their own, publish them to music streaming services, then claim the original artists stole their song after they get enough streams to have it be worth stealing their money. I’ve reported this app. That would be criminal fraud, and I hope Apple can find out if it’s what they’re doing and forward them to authorities if it is.