The founders of the company marketing this app are speech-language pathologists who were trained by PRC, and who used their knowledge of the Unity system to develop a Unity-like app of their own and market it in the Apple iTunes store.
If PRC was able to prove that to Apple, you hadn't read the OP but PRC had posted something about how people they trained stole their technology, would you direct the word "villain" towards Apple, PRC, or the makers of SpeakForYourself?
If I had a choice I'd keep the app on the app store. But, its important to keep a cool head and consider things objectively.