Atomic Loans https://atomic.loans/ is not in your DeFi Ecosystem overview.
Atomic Loans provides a mechanism for cross-chain collateralized loans. Specifically, the system allows people to borrow Ethereum-based USD stablecoins while locking Bitcoin as collateral. In case of default, the collateral is liquidated to make the lender whole. As a fallback for failed liquidations, the lender can eventually seize a portion of the collateral.