Hide Not Slide

Another dumb set of market structure questions, this time with a setup: I've heard a lot of opinions about the FTX-Alameda-Blockfolio integration with the consensus that it's not a good thing to have the exchange, broker & market maker all under one roof. My question is - Why?

The first obvious angle is the broker best execution argument. FTX isn't obligated to give customers the best price and can extract more money from users than it otherwise *should* or *could* if best-ex laws were in place. But this is not an FTX-only issue.

Most crypto exchanges house their own brokerages & attract retail users to their own unique ecosystem. Coinbase, Kraken, Gemini, etc... all face the same conflict of interest (customer transaction cost vs. personal profit). Let's put this to the side for now.

Another angle is the exchange + MM combination - FTX and Alameda coordinating their actions/sharing data is probably not a good thing. BUT - we have precedent here, specifically with CME:https://twitter.com/HideNotSlide/status/1323285688981327873?s=20 …

CME housed its own FX market maker for years that traded against its own customers & was kept completely separate from the rest of the exchange. They quietly shuttered it a few years ago, but they weren't forced to. The CFTC didn't say it was illegal.

The only issue I have with an exchange + MM combination is data sharing. An exchange can see 100% of the activity on its market, and a MM can't. If FTX is sharing all its data with Alameda, that's an unfair & unethical advantage. But do we know if this the case?