How did you get those accounts? I'm guessing you buy some people's KYC information, passports, identity cards etc online and create multiple accounts and start verifying the accounts one by one... so in future if anything happens to the account and the buyer is asked to provide some more evidence of ownership what will you do? Will you be able to help out in such situation?
Yes, things like that are indeed very difficult to prove if the exchange asks for proof through KYC as a valid account ownership, but people like this are usually clearly very ready to take any risks so they dare to do all things and one more thing, he will also take care of it very well.