I think it is a dangerous joke. I saw this today too, and I was a bit confused. I was thinking if someone already created a token called wallstreetsbets, and why would CMC be promoting it.
It kind of reminds me of Toilet paper Token that was also listed sometime back when Toilet paper became popular due to COVID19 
Personally, I don't think it's a dangerous joke because it's just listed there temporarily with no markets, perhaps they are trying to go with the current trend where wallstreetsbets and Gamestops have been talked about in the mainstream media for the past few days.
AFAIK they haven't created one... but someone could, and just try to sell to someone for 480 USD, which is a lot of money.
Scammers will always cling on anything that's trendy or catchy. I am pretty sure they already halfway creating such a token