Here's a tech sector example. If your startup wants to become an auDA registrar (i.e. of domains under .au) you must first spend six months as a reseller of an existing registrar.
You read that right. Planning on building anything innovative around a .au domain registration? Please, first funnel all your anchor customer registrations to a competitor. Oh, and build your stack and business processes around their platform, workflows, APIs &c.
What are the requirements to be a reseller? Can you just sign up as a regular affiliate, focus on getting your other stuff in order while driving zero sales, and then become a registrar?
I'm only guessing here, but I assume that any SaaS that offers a "white-label" service would need to be a domain registrar. Survey Monkey, for example, does this on the platinum pricing plan.
You read that right. Planning on building anything innovative around a .au domain registration? Please, first funnel all your anchor customer registrations to a competitor. Oh, and build your stack and business processes around their platform, workflows, APIs &c.