I originally chose to make my account on lemmy.world since all the content seemed to come from there. But I’ve since learned that I can fill my feed with stuff from any instance so it feels like it doesn’t actually matter if I’m on lemmy.world or not. At the same time, Lemmy.world seems to be frequently under attack so I’m wondering if I should change instance but have no idea what I should even be looking for when choosing.
It is, but the content that is federated varies from instance to instance. Instances only federate communities that a user on that instance is subscribed to, so the all feed is a combination of posts from every community that an instance member is subscribed to. For a large instance like lemmy.world that’s basically every community, but for medium instances there are various small communities they don’t have and for a small instance, the all feed will reflect the interests of the founding members.