It's mostly because the cosplayer is making money off what basically amounts to the carpet company's own design being sold for profit without their consent. A situationally trivial issue, and one that I doubt the cosplayer intentionally intended to profit from, but a legitimate claim nonetheless.

Anyone else notice that the Meowstic is wearing a Beret and Scarf, just like your standard snooty baguette-wielding French jerk?

Shouldn't that be the Chicago BlackBrocks.... ohhhhh.. uh comment withdrawn. Sorry.