I agree that the self-hosted set up is more complicated than say PlayFab, but it is not that hard to be honest. The setup for an instance of Nakama running on Digital Ocean is a fairly simple three step process:
What I really really like with Nakama is the clean API, the structured and easy to understand documentation with plenty of code samples and how you can build your own tailor made backend services from the (low-level) building blocks which are provided by Nakama.
Nakama has also created Hiro GDK which is a higher level SDK on top of Nakama to streamline development of your game’s online services. Currently only available for Unity, but I think you can expect to see something similar for other engines later this year.