From my limited understanding, the correlation attack being observed by node operators would be a useful vector against DHL's separate onions for vendors/buyers. Normally a traffic correlation attack would not be very useful as it's not illegal to browse a DNM without buying, but it IS illegal to be a DNM vendor, that's conspiracy to distribute at the very least. Just wondering if the two could be related, if so I'd keep my eyes on DHL market for now esp if you're a big vendor