While New Kajabi does allow you to have multiple sites with separate branding, integrations, and Stripe accounts, the intent is that all sites belong to the same owner.
Reselling, or otherwise managing accounts for other content owners on your own site is NOT allowed.
Each separate content owner would need to have their own Kajabi account that can be added as an admin to manage your Sites.
Eventually, we will even have an affiliate program where you'll be able to make money signing other people up with Kajabi!
Should you have any additional questions about this, please contact "firstname.lastname@example.org"