On the contrary, it seems extremely valuable to Disney to be able to force all disputes into individual binding arbitration rather than having to go through the courts.

On the third hand, it's debatable if anything on Disney+ is of any value either, so it could be argued that the deceased didn't get any value and isn't bound by the agreement.

(Yes, yes, I know that's not what you mean, nor is it what "value" means in a legal sense. IANAL, obviously)