

Let’s explain it this way: Microsoft has programmed a web service that is able to receive, view and send emails.
And Google has done the same, from scratch.
Email itself is merely a way different server softwares communicate with each other.
The same goes here. Some people developed a server software for receiving, viewing and sending ActivityPub content and called it Lemmy. Then other people figured it would be a nice project and did the same, from ground up, and called it PieFed.
They are the same thing. They also don’t have more content or less content. They have the precisely same content. I am writing this on PieFexd, you are reading my comment in Lemmy. And then there is also Mbin.



(And here’s a link to see it in action)

Yes on Piefed those are called communities.