This move strikes me as being a little too quaint for a financial service. I can't tell what I'd be signing up for. While their language is very friendly, it's also obtuse, and that doesn't foster trust.
(Josh - CEO, Simple)
In addition to the co-mingled account, everyone gets an individual interest baring account, which is directly titled in the name of the customer.
Either way, you can access your funds at any time.
In the case of the co-mingled account, we generate pseudo-account numbers that correspond to your portion of that account.
It is a complicated answer, but unfortunately, banking is complex. We do a lot of heavy lifting on the back end to make it as simple as possible for you.
I understand that your goal is to create the appearance of simplicity via complicated obfuscations. Those of us who are concerned about where our accounts live, and how they're structured, are not your prospective customers. So while I have no need for an invite, I wish you the best of success. Certainly some people will enjoy your service.
Banking with us does not obfuscate where your funds reside. It does, however, mean that you don't have to deal with a bank for support and technology issues. Instead, you get to deal with a company that's focused on those things rather than on managing a treasury, making loans, etc.