It costs money to fight it, but Zen Magnets will probably make a killing because of this. Maybe the Kinder surprise company will be more interested in fighting the ban now.
I think the Kinder-surprise company[0] has a lot more money than the magnet-surprise company, and my first guess would be that they don't think the liability risk is worth the effort.
[0]: https://en.wikipedia.org/wiki/Ferrero_SpA