We might want to see if they're actually trolls first.

While I know it's pretty de rigueur on HN to assume that anyone who issues a DMCA takedown is evil/a troll/an idiot who doesn't understand the internet, it doesn't mean that some of them aren't being filed because their copyright is actually being violated.

Until there's more evidence either from LayerVault that DesignModo has used their assets, or from DesignModo that they haven't - something beyond DesignModo just shouting "they're lying!" in any case, perhaps it's best to withhold judgement for the time being.