He should not be allowed to conduct such business either on the street or online. Law enforcement will go after "online" sites because they are a "big" target that can stop a large amount of criminal activity at one time
Well, I disagree on that. There is little to no purpose served by prohibition.
Additionally, they'll go after online sites because it looks sexy and gets headlines, and they can claim to have stopped a large amount of criminal activity, while actually having done absolutely nothing of any utility whatsoever.
It's barely even tinfoil to wonder if they're simply yet again favoring their preferred drug cartels in Mexico and South America.