I've seen a couple of clearnet websites that have been around for years that, although not directly, do create and promote a type of community where most of its members sell and buy stuff such as stolen/cracked online accounts, stolen databases, hacking tools such as bruteforcers, blackhat methods, perhaps a user may offer services for social engineering or a service for doxing for someone's financial or SSN information.
So although the website itself claims to be "neutral" and have a ToS that states that it does not promote such activities, pretty much half the userbase does it anyway, and half of the threads on the forums relate to doing something illegal or selling something stolen like a cracked game account.
Can such a website can be legally shut down? If so, how and would it be difficult?