Since Kickstarter is walking into the same land mines that eBay did, albeit with a slightly different flavor, it will be interesting to see how this plays out. The Vinted Goods folks can show pretty clear economic harm from the action, the mentor clearly thinks there is some sort of trademark, trade dress, and/or copyright violation. The story reads like a DMCA takedown although Vinted didn't provide details or a copy of the DMCA filing that they must have received (they mention a counter claim).
So what happens if you decide to make a Kickstarter Movie about a couple of anthropomorphized robots who end up on a dessert planet only to discover one of the inhabitants is destined to overthrow a totalitarian dictator? Hollywood loves to throw those lawsuits around.