Sorry to be blunt, but this is undoubtedly a bad move. It's like mixing the liquidity layer of USDS with the business layer of Spark. When liquidity dries up, users won't even have the chance to exit USDS at a discount. Also, this is something Curve already tried back in 2020. There's a reason why the market ultimately chose not to share liquidity with lending pools. And now both Fluid and Spark are going back down the same old path.