They are accused of promoting sportsbetting. The judgemet came on the basis of the wireact, which is all about sportsbetting.
It is definitely illegal to do anything with sportsbetting in the US.
There is no resident lawyer here, and no one can give you advice.
There is a lawyer who specializes in this: http://www.gameattorneys.com/
You might also take the time to read the posts here in the legal section and the industry news section.