I am sure more knowledgeable people will provide the right answers. But I think it means that when you set up your own lemmy instance, you need to add the communities to it.

Lemmy started getting popular in the last few weeks. Lots of new users, not enough new posts, users being shown old posts which they are commenting in. In turn those posts are making it to the front page of other users.

The karma though is what drove Reddit adoption to an extent. Gamification helps. It helped Reddit, it helped robinhood stocks app.

Maybe fediverse needs some gamification.

Or maybe not. Facebook and YouTube seem to be doing fine just using the line/unlike button.