Lifinity was the “original” prop AMM on Solana, pioneering the idea of protocol-owned liquidity (i.e., provided by the team themselves; no external LPs), with quotes adjusted based on oracle prices. Looks like operations have already shut down with zero volume since November 20. Although it's sad to see, it shows how competitive the Solana DEX landscape has become with the proliferation of prop AMMs (HumidiFi, SolFi, etc.).