There are no bridge risks for synths on Ethereum mainnet, as multiBTC metapool is a decentralized, trustless, and permissionless bridge that allows users to securely transfer their assets from the Bitcoin blockchain to Ethereum-based DeFi applications. The metapool is designed to provide users with a secure and reliable way to move their Bitcoin assets to Ethereum-based DeFi applications without the need to trust a third-party custodian. This ensures that users can take advantage of the DeFi applications without having to worry about the security of their assets.