Maybe naive, but here's what I wonder. Why doesn't someone write an exchange, open source the code, and build transparency in from the beginning? Publish every

Maybe naive, but here's what I wonder. Why doesn't someone write an exchange, open source the code, and build transparency in from the beginning? Publish every wallet address with no associated info so users can watch transactions on the blockchain. Publish cold wallet addresses too and automatically route, say, 90% of deposited BTC into those. With such a system, you could transfer in BTC and watch 90% of it go to an address the exchange claimed was a cold wallet (I don't know how to verify that other than by trust, but this level of transparency is at least more than what we have today.) Just to be clear on what I'm not saying, I don't claim this will solve all problems. I also don't claim that it is preferable to keep a significant amount of one's currency in a remote account. But people are going to do it anyway, angry/snarky/intelligently-worded arguments not withstanding. Why not embrace the transparency these platforms offer to buoy user confidence? Even if you could start your own exchange using this codebase more easily, most of the value from such a service comes from professionally maintaining quality infrastructure, providing trustable guarantees on security, etc. The alternative is a series of crappily-coded exchanges that will continue failing due to poor code and lack of transparency. I don't know how to solve the problem of nefarious parties starting exchanges with this code, but solving that problem isn't my intent.