Exploiting a bug to gain a finacial advantage is considered fraud. No matter if it's on a blockchain or not. I think in most countrys you could go to jail for a long a few years for this. Even thought they can't change the blochchain. i hope they take legal actions.
RE: ⚠️A few Hive and GLS community members colluded to steal more than 250k USD // Biggest theft since Justin// The GLS exploit explored