Tengji Zhang

Aggregators: Aggregating an individual's on-chain activities spread across multiple wallets and chains.

Ethereum is New York City; it is a happening place with the biggest DeFi protocols, the most TVL, the hottest DAOs and NFTs, but it is expensive. You scale by "building up skyscrapers" using L2 chain or "building out satellite towns" using interoperability networks that serve as highway connecting them.

Proof of Humanity: Prove unique identity associated with each individual is necessary to protect against sybil attack.

Algorithmic stable coin is not very reliable because the assumption about the underlying volatility assets could break once in a while. Consider Long-Term Capital Management.