There are several larger private chains, including at least one that has a built in decentralized marketplace. But adoption is very low. People may not know t

There are several larger private chains, including at least one that has a built in decentralized marketplace. But adoption is very low. People may not know they care about private transactions until too late. In the end, it might depend on a chain becoming popular first before people want to use privacy features on top of it, like using Ernst & Young's Nightfall protocol that's built on top of Ethereum.