If the creator intended a meaning for the piece, the creator.
If the creator made something just for the fun of it and came up with a meaning afterwards, still the creator.
The audience can’t change that but what they can do is to not give a fuck about what the creator thinks so they are free give whatever meaning they want. Specially when the authors are no longer around to complain or explain what were their intentions.
If the creator intended a meaning for the piece, the creator.
If the creator made something just for the fun of it and came up with a meaning afterwards, still the creator.
The audience can’t change that but what they can do is to not give a fuck about what the creator thinks so they are free give whatever meaning they want. Specially when the authors are no longer around to complain or explain what were their intentions.