Deciding what is or isn't a "scam" is really a job for the independent judiciary. But getting a ruling is difficult and time-consuming, and also largely pointless because a new website can be created almost instantly, and there are many foreign ISPs where you can't get a ruling at all.

I don't really disagree with your basic premise that "disconnecting the bad actors' ISPs from the Internet" is the ideal solution, but this is far more difficult than your comment implies – almost impossible with how the internet currently works.