Explosive truth behind crypto bots that front-run thieves to “save” funds — but they decide who gets paid back

Following a $4.13 million exploit at Makina Finance, an MEV builder front-ran the hacker, redirecting the stolen ETH into its own custody, highlighting that MEV actors are becoming crypto's de facto, yet unaccountable, emergency response system. This pattern, also seen in the Curve exploit, occurs because sophisticated searchers compete in the public mempool to reorder transactions for profit, often successfully intercepting theft. However, this reliance on MEV infrastructure is problematic because block production on Ethereum is highly concentrated through MEV-Boost and a few relays, placing rescue capacity in the hands of profit-maximizing intermediaries with unclear accountability regarding fund return terms. To address this, frameworks like SEAL's Safe Harbor aim to formalize this process by allowing protocols to pre-authorize white hats with explicit Service Level Agreements (SLAs) and defined bounties, as seen in Immunefi's stricter six-hour window. While Safe Harbor attempts to civilize the chaos by establishing rules, its success depends on builders respecting these terms and protocols adopting the framework quickly enough to prevent situations like the Makina case, where funds remain in builder custody with no clear path for user repayment.

(Source：CryptoSlate)