Are there grey areas? Sure. In particular there's a passive sort of deceit in which you let people assume things that you know aren't true, to your benefit. Mostly the law holds that it's their mistake for not asking, and anyway they'd usually be far too embarrassed to make a fuss if they realise their error.
I don't see that here, the plan was explicitly to trick the RIR into giving them resources they were otherwise not entitled to. Those resources were for everybody to share, they're stealing from you and it's appropriate to prosecute for fraud.