If i do get in trouble with the law or something
So far as I know, the worst that can happen if you get sued is that the courts might order you to pay money to the people who are suing you.
However, even if that happens, the amount of money will be based on how much financial damage you caused them. And I'm not sure that you actually cost these people much money.
And if these guys actually go into court and provide proof that they are making money off this private server, that will be something that Blizzard's lawyers will be very
interested in knowing about.
I suspect that the biggest problem that this will ultimately pose for you is that it will force you to hire a lawyer.
Unfortunately that is still a problem. Lawyers are expensive.
This lawsuit does have the potential of backfiring on them. Instead of just being some minor private server that no one has heard of, they might become infamous. That might make it more likely that Blizzard's legal department will pay attention to them. And it might also draw the attention of other hackers.