I think maybe you're out of the loop here. This is part of a trend to screw over bots that automatically steal art and sell it on random sites. That's why others are commenting stuff like "I'd buy this on a t-shirt!".
The tactic has already been proven to work several times, when people post stuff like this, and then report the shops that steal it to Disney's legal team. It's a clever way to leverage Disney's lawyers to protect regular artists who couldn't afford to sue all these random websites.