It's not ok to steal the design either, that's arguably the worst infringement.
Don't know why there is a widespread belief that it's fine to steal a design wholesale if you just don't put logos and names on it.
Well, I think many of the folks here have pretty much come to the conclusion that these mechanical tube mods are all basically of the same design ... A tube is a tube, and the top cap and bottom cap / fire button varies slightly, but not much between the various mods. I personally don't think these Chinese manufacturers are really "cloning" much of anything when it comes to mechanical mod "design".
Now when they engrave the original manufacturers logos / designs and names on the clone ... Sure, that's just
morally wrong ... and it's
legally wrong if the original manufacturer has a copyright on there intellectual property (ie: logos).
At least, with the majority of mechanical mods, these Chinese companies (and there distributors) are at least advertising them as "Clones" right from the get-go. There not hiding anything ... What's really bad is when they manufacture fake items such as clearomizer coils and various batteries and market them as "originals" ... That's the real problem that needs to stop!