Various businesses in the usa require licensure to operate. These are often done at state or even federal levels. Not every business has one, but even an EIN provides them more information about who's paying for the service.
Not every business has an EIN. I'm kind of surprised at the number of regulatory hoops you're willing to jump through to negotiate a minimal level of service.
Looking at it from the point of operations of the affected company, this doesn't sound like minimum level of service. Instead, DO was the entire business structure of the company. As a company, if you're entire business plan depends on the services of a 3rd party, it is not unusual to go through extra steps to ensure 3rd party can't end your business. Running an internet driven company from a consumer service from ATT/Spectrum etc is suicidal. If your network goes down, they'll fix it when the get to it. With a business level account, they have much more guarantees to keep your signal hot. Running a POC off of a free tier of AWS/DO/etc is fine, but these guys were well past POC.
