As someone working in the financial industry, the amount of regulations, internal audits, external audits, reporting requirements, etc. that financial institutions have to comply with is truly staggering.
Sure, they 2008 financial crisis demonstrated that all of this was no silver bullet, but I still consider that system many orders of magnitude more trustworthy than a system that allowed for the shit-show that was MTGOX, and other failed exchanges.
Bitcoin itself is completely auditable in transparent. The system will behave exactly as the code is written.
tl;dr: Neither Ethereum nor Bitcoin have address checksums on the protocol level (remember this HN thread here is about trust) but by now all Bitcoin clients decided to implement it. In this case, the exchange used an Ethereum client which didn't.