If you check muesli swap smart contract - Address addr1wy2mjh76em44qurn5x73nzqrxua7ataasftql0u2h6g88lc3gtgpz - Cardanoscan you will see that in the future there is probably going to be substantial amount of ADA locked in smart contracts powering various DEXes. Muesli is not even very popular project compared to Sundae or ErgoSwap and yet their SC has over 50k ADA locked inside.
Is it technically possible for smart contract addresses to be staked? If not then I guess this will be significantly different model to CEXes and other custodial wallet providers, who usually do stake their underlying cardano wallets.