Two things in DeFi trace directly to Compound: algorithmic interest rates that adjust with pool utilisation, and the governance token distribution that started liquidity mining in June 2020. Both are now universal, and neither secured the protocol's position.
The v3 simplification
Compound III restricts each market to a single borrowable asset with other assets serving only as collateral. That eliminates the contagion path where a bad collateral listing threatens borrowers of every other asset, and it makes the protocol's failure modes enumerable — a meaningful safety property that the more feature-rich competitors do not have.
The 2021 distribution bug
A governance upgrade contained an error that distributed roughly $80m of COMP to users who should not have received it, and the protocol could not reverse it. Depositor funds were unaffected. The episode is a lesson in upgrade review rather than lending mechanics, and it cost the treasury real money at a moment when the protocol could not afford the reputational damage.
Where it stands
Sound, conservative and much smaller than the protocols it inspired. That matters practically: thinner liquidity means worse rates and harder liquidations, so being second-tier is not purely a matter of prestige.
Who should care
Anyone studying how first-mover advantage in DeFi decays, and users who want the simplest lending structure available with a long safety record.