The distinction between author and their estates is fascinating: the stereotype is estates mismanaging the art, but that usually happens because the estates want to be “artistic” themselves.

Most artists are terrible at business. They do dumb things for no reason.

JRR Tolkein and his estate is prime example. JRR signed away all movie rights for a nominal sum. His estate fought tooth and nail for their rights, while still allowing grey zone stuff to develop (Dungeons and Dragons).