What's the legality of this?

So I recently purchased a steam deck, and decided a wanted a "vinyl skin" for it to make it a bit more unique. I had a google and found multiple companies that offer pre designed skins for the steam deck and a variety of other consoles and devices.

It got me thinking. I assume they don't have a license to be selling all of these products, so do products like these fall into some sort of grey area where the companies that make the devices can't prosecute? I've tried to google around but can't find any information, I appreciate it's quite a specific question.

I'm in a position where I could do something similar so just wanted to see if I could find any answers before looking into it further... If there are any other subreddits better suited to finding an answer that would also be appreciated :)