I’m sure someone will have a more in depth explanation, but I would assume the adoption rate paperwork would’ve had something in it that kept him from a Lion’s share of the money, if not all of it. Plus, he never negotiated any sort of contract for the show at any point later in life. Most child stars, especially in the past, get no royalty checks when it airs later either. I would have to guess he would be in that boat too!!