Matt decided to keep the app and have him be the only one who has and knows about it. He went on the app and made that the Chronivac app he is using is the only one in the world and there is no PC version, he also had the knowledge of making the Chronivac app and PC version be known only to him so he can modify and improve the app. He had it so that only he can see and use the app but if he ends up in a permanent death then the next person who finds it and decides to use it will have it locked on them. He hit the change reality button after making it so only he is aware of the changes and the app doesn't be removed from reality by any of the changes.
He then had information about the app appearing in his mind. He grins and thought about what to do next. Should he change himself or try it out on his mom or little sister? Or use it on the world?