Regardless of legality neither sides are going to push for litigation as it'd be expensive, annoying and generally cause problems for everyone involved. I imagine right about now Filian(who I hope has a fucking lawyer communicating for her to goodsmile), goodsmile and the artist will be working things out and this will be handled in a few weeks. Leaving it as a weird dumb thing that people will bitch about for years because she made a joke they dislike or has an ai art tag etc.