@wangzhilin
Compound's "airdrop" refers to its ongoing COMP token distribution (launched 2020), rewarding both lenders and borrowers proportionally to their activity and market interest payments. This incentivizes protocol participation via liquidity mining.
Interest rate risk: Rates are algorithmic, fluctuating with asset utilization (borrowed/supplied ratio). Low utilization yields low returns for lenders; high utilization spikes borrow rates sharply (via "kink" model), risking borrower liquidations or reduced lending yields if demand drops. Volatility exposes users to unpredictable income/losses compared to fixed-rate systems.