Mastodon: @canpolat@hachyderm.io
I don’t follow it very closely, but as far as I know, they are the only one implementing the open protocol they designed (which doesn’t interoperate with ActivityPub). However, there seems to be some efforts for creating a bridge: https://www.docs.bsky.app/blog/feature-bridgyfed
As you said, there are some recognizable faces and that may impact the adoption. But not being compatible with ActivityPub is a real bummer.
I think single account ActivityPub implementations are addressing a weakness of the Fediverse: one’s identity (handle, username) is tied to an instance they have no control over. If that instance shuts down users lose everything. With a single account instance, you take that control back. And since it doesn’t need to scale the architecture can be much simpler and can be deployed to much cheaper infrastructure.
The demo was not straightforward, though. And I didn’t quite get how a user can follow Mastodon users, for example.
I mainly develop in C#, and I agree that having to write so much boiler plate for type safety is really boring. C# is not perfect either (it doesn’t have discriminated unions, etc.) but at least it gives type safety out of the box.
However, in general, I think enums are widely misused. I see a lot of cases where they should have been classes with a factory, but ended up being enums with a lot of static functions and switch statements.