Arbitrum's anti-witch rule has a vulnerability, with 21.8% of the airdrop allocated to 150,000 witch addresses and at least 4,000 witch communities

According to ChainCatcher news, research from the data analysis platform X-explore indicates that the anti-Sybil rules in this Arbitrum airdrop have created a "significant loophole," resulting in approximately 150,000 Sybil addresses and at least 4,000 Sybil communities profiting over 253 million tokens, accounting for 21.8% of the total airdrop amount.

X-explore speculates that Arbitrum's rules are as follows: exclude cross-chain bridges, centralized exchanges, and smart contracts when detecting Sybils; apply relatively lenient detection for small-scale, same-person addresses; only use data prior to the snapshot (February 6, 2023) for Sybil detection; and only data from Arbitrum and Ethereum is used for Sybil detection, ignoring data from other Ethereum Layer 2s, such as Optimism and Polygon. These Sybil detection rules create significant loopholes, and based on the above rules, X-explore detected Sybil address data through an internal same-person address/Sybil address identification model. (source link)