If the claim is true that they vibecoded the app, and if AI output is uncopyrightable, technically they are in violation of DMCA and someone that can afford it could fight back and be rewarded, no?
I believe the USPTO has said that ai generated works are not copyrightable. They would likely have to fight this in many jurisdictions with different rules about these things.
The follow on question is "if one cannot copyright, does the same apply to licensing?"