Earlier quoted context omitted.
As a follow-on to this, it certainly appears (from quick searches of your site as well as reading through this thread) as though you are not disclosing which banks you are specifically partnering with... this is certainly your choice, of course, but given the events of the past few years, I think that there's a significant number of people that make an active choice not to use certain banks due to their past behavior…
We've disclosed all of our bank, technology, and processing partners. I don't think we're likely to allow customers to choose which partner bank holds their funds, but we do make that information transparent.
Edit: it looks like you disclosed two partner banks at http://www.simple.com/blog/Simple/partners-funding/, but I'm not sure that this is a conclusive list.