I don’t think it is more complicated than, e.g a VPS provider or a SaaS platform and a customer that wants to have run a server online or a managed application.
That’s a very reasonable comparison, but to me the more relevant comparison is that of creating a commercial social media account or standard fediverse account today. This is much less accessible to users than that process, and also much more demanding on server admins.
I’d certainly be overjoyed to learn that I’m wrong and for this to revolutionize account mobility. But I don’t see volunteer server admins lining up to facilitate DNS delegation for fun or users lining up to pay VPS prices for commercial hosting of their own social media domain. The bar for simplicity and usability for me is quite a lot higher than I see this sort of approach evolving to provide.