If they're set on going down the lawfare route, they're unlikely to have to sue anyone. They will use DMCA takedown notices and scary C&D letters, and many people will just comply out of fear. The USA is a cyberpunk dystopia, remember? You pay your own legal costs even if you win the case.They can't "make money" suing people.
Hiring proper lawyers, building a proper case, going to court, and so on, even if the other side didn't even turn up would likely cost WotC far, far more than the amount of damages they could realistically extract from any of these websites.
They might sue some for the deterrent value or even just out of general malice, but they sure as hell aren't going to be suing them to "make money".
What does WizBro gain by this? They create an atmosphere of fear, which serves to keep people compliant and in line. This lets them build walled gardens that they can monetize.
And you're aware that this just happened with Games Workshop and their fan content policy on animated films, right? Games Workshop is trying to shut down fan animations