Why? As you just pointed out the biggest copyright threat to the game isn't Marvel, DC, or Disney—it's NCSoft. If Marvel gets their panties in a bunch over all of the Wolverine clones they send a DCMA complaint to Homecoming and, in accordance with copyright law, Homecoming zaps the offending character. As long as they do so promptly Marvel et al have no legal claim against them.
NCSoft does. Every single NPC in the game, all the powers, the maps, etc. all of that is NCSoft's intellectual property. And they could, at any moment, waltz in and shut the whole thing down. Anyone who spends their time fretting about Marvel, DC, and the rest is basically rearranging the deck chairs on the Titanic.