Breadwallet is open source and anyone is free to fork the code and make their own wallet, which is what Robert Genito of wall-of-coins did here. He integrated it with their exchange service. I know him personally and have no reason to think there's anything untoward here. He asked permission to use the code even though it's open source and he didn't have to.
Is this not a risky route to follow? What if someone used this code to mimic or spoof your wallet and then insert malicious code to steal people's private keys? This will taint the original Breadwallet's
reputation, if this was done to people. In any case, If you can vouch for him and you trust his integrity enough to put your own reputation on the line, it is surely legit. It takes a lot of time to build
trust, it takes one incident to destroy it.
I haven't reviewed his code changes so I can't vouch for it. I can only say that I've known him personally to be a nice guy.
As far as open source, the original Bitcoin code itself is open source, and runs on systems that dont enforce code signatures, so anyone can make a bad version that overwrites the original. This can't be done with mobile apps like breadwallet. If someone uses our name and logo to confuse people, we can report it for removal from app stores.