What are some of the commonly adopted use cases for BaaS platforms?

Guest: So if you order from DoorDash, the guy picking up the food on your behalf has a virtual card and he pays for the food on your behalf that you paid to DoorDash, right? So DoorDash takes your money, puts it into a virtual card, the courier goes into restaurant, pays with the virtual card for the food and then picks up the food and gives it to you. So that flow of funds is through Marqeta. And for Uber, Uber pays out their drivers same day if they want to, in order for Uber to do that, I believe that they partnered with the Green Dot. And essentially what it allowed to do is that if I'm a driver at the end of the shift, I could say: “okay, give me my money.”

The mechanism that they use here, and this is like a very important distinction, I saw on the Brex website, they use the Visa MasterCard rails to push that money. So they pay return interchanges. So they pay 1% or whatever it is, although I'm sure Uber got a very good deal and insurance less than 1%, but the interchange it's very expensive. It's not like ACH, but the plus side is that it's near instant. The downside is that it's expensive because you can imagine Uber has millions of drivers.

Then there's the issuer processor. This is important because these guys take the majority of the money.

You can imagine that if you need to pay your issuing bank, your sponsor bank some money, and you have to take out a layer of some money and your main business is interchange. It's extraordinarily difficult for you to make money. 

And you need to have a huge scale before you're even contribution margin profitable, right?