Quite a big amount if you're just testing the platform I'd say. It may be backed with big fellas but being one of the early adopter has its risk as always. In any case, good luck!

Also, strange. If they're claiming they don't accept retail customers, they most likely don't have the legal rights for it. I'm not saying it can't happen but with how rigorous their onboarding process is [from what i see on the website], it'll be a lot harder to slip through retail customers "by mistake".