The bank will only be your agent. Your money will be segregated and held at the stock exchanges. That is the law and should the bank go bust, your money will not be a bank asset.
http://www.moneyweb.co.za/investing/what-is-happening-at-deutsche-bank-and-how-might-it-affect-my-etfs/
That Coreshares S&P EFT is starting to trade on Friday. Could be a lower cost option than DBXUS
Have they published the TER for the coreshares S&P?