On Saturday, Avraham Eisenberg, admitted that he was part of a group that drained $114 million from decentralized crypto exchange Mango Markets last week, and returned $67 million to the Solana-based DeFi hub, even as he defended his actions — which some have called an exploit — as both legal and highly lucrative. The exploit is one of several to plague platforms in recent weeks. Earlier this month month, BNB Chain, a blockchain closely connected with crypto exchange Binance, was the victim in a hack that ultimately drained the ecosystem of $100 million in crypto.