Ethereum developers concerned over potential block-building disruption in Glamsterdam test

Ethereum developers have raised concerns regarding the upcoming Glamsterdam test on the Sepolia testnet, scheduled for October 6. The test introduces ePBS (EIP-7732) to integrate the builder market directly into the protocol. Because testnet Ether lacks market value, developers fear malicious actors could repeatedly win block-building auctions and then withhold transactions, rendering the chain unusable. While the mainnet would require real financial stakes to perform such an attack, the Sepolia testnet lacks this barrier, leading to discussions about potential safeguards like builder whitelists or minimum deposits.