There is talk of having post types. This would allow for further fediverse integrations to function better.
To answer your questions:
- Sublinks isn't a copy of Lemmy. There used to be a greater focus on multiple post types, but now it's not a main feature to work on. Sublinks is an alternative to Lemmy that adheres to the Lemmy API to capture the client base for that API. Sublinks has its API for its front-end and any apps being developed for Sublinks.
Being long-term compatible with Lemmy isn't a priority either. We set our first milestone to be parity with the Lemmy API contracts to allow for apps to work from the start. As we grow our footprint Lemmy would have to display it the best they can. We don't plan to add support for Sublinks into other applications.
- Yes, we're building our federation service to include as many services as possible.