No, it's not goodwill, it's obligation. When people bough FUN token, they were informed about benefits of Freebitco.in premium membership, one of it is certtain amount of free WOF spins. This information is still displayed on their website. So, it's not goodwill, they're just not giving what was promised.
Thank you for clarifying that, i was never an active player on their platform, so i don't know how their promotions work. However, looking at the number of users who have been complaining about these spins, it is obvious that it couldn't have been a promotion that required no obligation from customers. From what you have said, i believe players are right to complain as the promise they had with the service was broken.