[Dismas]

Thanks. So what can be learned from this takedown, what mistake(s) did Slipp Marketplace make to end up like that?

The story always ends the same for people that sell bank/payment details clearnet. I've seen it about a dozen times. If their registrar/hosting is in a country that forbids it (or has treaties), it's likely a van is already on the way. There is nothing G-men target more than credit card fraud, which is why we've always steered clear.