There is no intellectual property protection on most elements of a case hence the cheap knockoffs. Personally I feel the best way to combat this sort of occurrence is a.) not to purchase from them and b.) don't bring awareness of them into the community that would likely be buying Dan's case otherwise (I'm not calling you out by the way)
I just hate how big corporations like Kolink (same parent company as Noctua I believe) are as comfortable as they are performing a wholesale ripoff of someone else's design, providing no reference or credit, and then undercutting them using deeper pockets and greater manufacturing capacity. Additionally, I'm kind of surprised that Caseking is carrying it alongside Dan's own case (which I believe they have had exclusive reselling on to date) when it is such a blatant ripoff.