Lots of options here TBH and I haven’t put much thought into it. Providing a service by running and managing software updates, migrations etc…, is one. MongoDB Atlas and Confluent Cloud are good examples of what I had in mind.
Why do people hate the “as a service” model?
SPAKE2+ is probably something worth researching as the server never receives the password. I believe it’s used in HomeKit and Matter as well 🙃