Most use cases for Quest On Demand Migration are when a customer has an old tenant, and for some reason they have to migrate their data to a new Office 365 tenant.
I'm an independent consultant working with products from Quest, and doing projects with those products for my customers. Certain customers organize their licenses themselves, because they have their own dealer. In some cases, I also organize the license and resell products to the customer.
On Demand Migration is a cloud product, software as a service.