Is that legal? And I wonder what would happen when after buying an account, the platform asks for verification again sometime later, it happens sometimes in platforms where they ask to re-verify the account just out of suspicion.
It cannot be legal, especially if we take into account that the documents used to create all these accounts are very likely stolen or falsified. Of course, there is a possibility that the owners of these documents sold someone the right to use them, because in some countries people do such things.
No matter how you look at it, anyone who uses such accounts can find themselves in trouble, whether it's that the company will detect that something is wrong, or that the real owner will realize that someone has stolen his identity.