From what I can tell, it's a for-profit company for a single dev that is attempting to get by through nothing but GitHub Sponsorships.
Said sponsorship is a requirement for using the pre-hosted files for commercial uses in a SaaS-like manner.
But some of the wording in the faq is a bit confusing. E.G. There's a whole section about "Why don't you just sell plans for the hosted API?" right after detailing how to sign up for said plan for the hosted API.