Aave and CoW Swap postmortems dey clash after $50M aEth swap fail; MEV knack tens of millions

Aave and CoW Swap don publish conflicting postmortems after one DeFi wahala wey happen for weekend. One user try swap about $50.4M aEthUSDT to aEthAAVE with Aave’s CoW Swap widget but e receive only about $36,000. Aave talk say the user confirm 99.9% price-impact warning and blame the illiquid market; dem deploy "Aave Shield" to block swaps wey get price impact more than 25% by default. CoW Swap report plenty execution faults: one legacy hard-coded 1,200,000 gas validation cap wey reject safer, higher-return quotes; solver execution failures (the optimal solver win but executions fail); and likely one mempool leak wey expose the pending tx. On-chain analysis show MEV extraction: one Titan Builder block builder supposedly capture about $34M in ETH for block sequencing, and one MEV bot make about $9.9M from sandwich attack inside low-liquidity SushiSwap AAVE/WETH pool (~$73k). CoW Swap say one unverified best quote fit return $5–6M if the gas cap no reject am; dem correct the reported swap fee to $110,368. Neither team fully pin the actors; both highlight protocol and execution-layer risks: user consent to extreme slippage, mempool visibility, protocol gas/routing limits, solver reliability, and MEV-enabled block-building services. For traders: affected tokens include aEthUSDT and aEthAAVE (AAVE exposure). Expect more focus on MEV mitigation, tighter default slippage protections, and possible short-term sell pressure or volatility for AAVE and related liquidity tokens. Monitor protocol patches (Aave Shield and CoW Swap gas/routing fixes), on-chain MEV flows, and liquidity depth before you do large swaps.