It's not a legal requirement for them (AFAIK) to make decisions on allowing someone to register a domain or not. They're a private business, so my argument is

It's not a legal requirement for them (AFAIK) to make decisions on allowing someone to register a domain or not. They're a private business, so my argument is it's (probably) in their best interest to not upset their customers and partners. There are plenty of examples of limits on almost all registrars, and I was curious why they have such a hands-off stance on bulk registrations very clearly being used for illegal activities. Ted's answer gives me partial insight, but my takeaway is not enough damage, legal risk, or people complaining to say no to the money.