This opportunity acts as a savings account denominated in USD.
Risks include potential vulnerabilities in bridge smart contracts. Across mitigates this by utilizing canonical Layer 2 rollup bridges, which use validators on Ethereum to verify the validity of state transitions between chains. Additionally, Across leverages UMA's optimistic design, adding another layer of security through its dispute resolution mechanism as it only takes one honest watcher to dispute an invalid transaction.
Your yield comes from earning fees that investors pay when bridging DAI across various L2 networks and protocol incentives. The yield can change depending on transaction volume and value.