That said, I don't think acceptance by dark markets is something to seek. Most of the DNM stories have been tragedies, leaving confiscated coins and ruined lives in their wake, and I predict the next major dump of XMR will be thanks to a FBI seized assets auction. Too centralized and too big a target, plus the cumbersomeness that comes with operating and using a dark site. It may be obsolete tech now.
Thats a one way of looking at it. Also keep in mind that Satoshi is in FBI's and several other agencies most wanted list. Shadowmarket, if it will ever become a popular demand, might cause troubles to their devs due to illegal trades going on. On the other hand its no secret that FBI decoded tor and watching people.
I think the devs are safe, being they have not a bit of control over what we do with our wallets or coins. This is why it's imperative that the wallets be uncensored, for once the the devs have the power to control what we do there will be a demand that this power be used. And being it's open source it would be easy enough for anyone who knows code to remove whatever they were forced to do.