Earlier quoted context omitted.
I also think it's important for the artist to remember that Disney doesn't have a team of employees surfing the web looking for ideas to steal. The more likely scenario was a single designer was having trouble with a project and got desperate. It's not excusable, but also isn't as conspiratorial.
Spare me the violins. This is a billion dollar global enterprise not a Mom and Pop. Its Disney's responsibility to make sure they have the requisite licences and in this case they appeared to have failed in that duty.
My theory is that it was from a 3rd party contractor and it just slipped through.