There was a time when 4Kids projects were everywhere. They built on the runaway success of Pokemon and start scoring Teenage Mutant Ninja Turtles and Cubix and YuGiOh and all kinds of stuff. How did they wind up in bankruptcy?
Well, it turns out they were using the YuGiOh license in ways that weren't covered by the contract. The Japanese rights holders told them to pay up. They couldn't negotiate their way out of it, and they're toast.
Never forget -- as quickly as you can succeed, it can vanish.