Fox are preventing their own customers from customising their purchase with well-made decals, and thus engaging more with their brand.
By not taking action years ago, they’ve implied they’re ok with it and Slik have grown a business on that premise.
It’s dumb.
I understand the copying-without-permission point, but Fox could have taken a much more enlightened approach by allowing them to licence it at low cost/free, or pre-approve designs, or partnering with them in some way.
Just because you’re right in law doesn’t mean you’re right in principle, or that by winning in court, you win. They need to see the bigger picture.