Obviously when NCSoft bought out Cryptic, there were terms of the deal that we don't know about. Things like the game engine, who was allowed to leave and end their contracts, and what they were allowed to make afterwards.

NCSoft obviously didn't have any clause that stopped them from making a competing super hero MMO. That is NCSoft's fault, not Cryptics. Obviously they let them keep the studio name, so again, NCSoft's fault, not Cryptic. And again, NCSoft allowed them to keep the rights to, or use, the game engine. Once again, NCSoft's fault, not Cryptic.

Cryptic has done nothing illegal or wrong. It was just oversight or foolishness on NCSoft's part. They didn't cover their bases when Cryptic left. That was stupid on their part.

So perhaps you should be asking NCSoft why THEY didn't put in any legal contract preventing Cryptic from doing all those things, because obviously, they didn't.