Which product would that be then? Got a link to the product the Nobsound ones are ripping off?
I got a bit irritated a while back by someone buying and building what was effectively a kit that not only purported to be a circut based on a Kondo preamp, but came with a a fully-marked up, Kondo-branded case as well. Now in my book, that's a knock off in similar vein to someone sporting a fake Rolex from the looky-looky man.
On the other hand I see the Nobsound dampers for what they are which is a capable but somewhat basic implementation of a common enough idea. There is no passing off something as what it isn't. I wrote above that they are not as good as my ten times the price Townshend Seismic Pods (which were in the market long before Viablue - did they rip off Max's idea? Or is the idea obvious enough, and the execution variable according to price point?). But categorically, they are not junk and I don't believe they are any kind of fake either.
I've bought a few Nobsound products over the years and they are exactly what you'd expect, cheap, functional, arguably somewhat derivative designs but executed at reasonably quality for the prices asked. As for derivative, the fact is that copying and not innovation is actually the norm in the hifi industry, from the Williamson circut onwards but only really becomes an issue when the rip-off is blatant and patents or trademarks are infringed. I see no such issue here. I'm happy to be proved wrong though.