I am not surprised that people will try to sell any sorts of forbidden items in there. Some of course will just be scammers.
Yeah, I get that people's motivations are going to run the full spectrum in a truly open marketplace, but the fact that something like that showed up in a Mycelium wallet does surprise me--and you're right, they ought to have somebody moderating what gets put up for sale.
I haven't used Mycelium in a while, so I wasn't aware they added a feature like this, though I did read a thread recently about how they're expanding their partnerships and so forth. But Jesus....this is like having a drug dealer just knock on your door and offer you some cocaine for a good price. Crazy.