PieFed is absolutely a “derivative” in terms of its DNA. It’s basically built as a love letter to Lemmy’s specific flavor of ActivityPub.
If you look at the raw JSON, PieFed isn’t just “using ActivityPub”, it’s specifically implementing the “Lemmy-isms” that make the Threadiverse work. It uses the same Group actor logic, the same Dislike activity extensions for downvoting, and even mirrors Lemmy’s API routes so you can use apps like Jerboa.
In a way, it’s like how a 3rd-party controller is a “derivative” of a PlayStation controller. The internals are completely different, but it’s shaped exactly that way so it can plug into the same console and work perfectly. PieFed chose to speak “Lemmy-ish” instead of just “ActivityPub-ish” to ensure it wasn’t an island.












I’m definitely not a socialist. .ml is where I landed when I joined due to not knowing any better and joining the largest (at the time) instance, and honestly the outside hate is keeping me there.