Risto, don't you think chances of Poloniex being involved in margin trading themselves is 'marginal'

considering the regulatory framework they've to comply to? If you get caught with that, you'd have to close shop.
Speaking of regulatory framework, the BitLicense is out, and this part stuck out at me:
"No Licensee shall engage in, facilitate, or knowingly allow the transfer or transmission of Virtual Currency when such action will obfuscate or conceal the identity of an individual customer or counterparty."
In other words, if they are using a mix-in value greater than 0 for individuals in the State of New York, might it be a problem for them?
I don't really see it. If they are sending coins to you, then
where those coins came from (which is what mixing does) is not obscuring the identify of you as their customer. They will have a record of sending coins to you, along with your KYC information. Should be good enough.
To me that sentence prohibits allowing things like straw buyers. I don't know how it would be interpreted in practice though, that's one of the problems with writing regulations for technologies that are in a fluid state of development and not even understood by the people writing the regulations.