The product is in early days and in a closed alpha right now. We're looking for test users that are willing to work with us and provide feedback as we squash bugs and build out the platform out of it's infancy.

What you just described is the whole point. If you just responded to that email, one of the co-founders would reach out directly with a question or two and next steps.

We know we are dealing with a touchy but all important subject of managing people's wealth/investments, so it would be irresponsible to allow open account creation and access to investment recommendations without doing our due diligence as founders at this stage.

You might not like the approach (totally fair), but it's brought us incredibly engaged and enthusiastic initial users who's feedback is directly going back into the app in a quick iterative loop.