Mm, no. Fortnite makes money by selling good to children. They make more money if they create an environment which stigmatizes not spending money, which is a tactic to which children are especially vulnerable and which necessarily leads to a group of children being stigmatized against by their peers. It's hardly "think of the children" to take issue with a business model which is demonstrably harmful.

Also, "children will bully each other no matter what" is not a rational response to something which exacerbates bullying. That's like saying "accidents happen no matter what, this is no worse than normal" with respect to a defective car with broken airbags.