this post was submitted on 03 Jun 2023
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Because certain types of content and users might have negative value in a given environment.
I'll use a mild example to illustrate that. Let's say that you got two instances:
If both instances are federalised you'll see alicelemmy's posters doing shitty jokes in boblemmy, and boblemmy's posters trying to argue the jokes in alicelemmy. Both communities became less useful for their respective users, because now alicelemmy isn't just a place to shitpost and chill, and boblemmy's content has become less serious.
This happens a lot in Reddit, as a consequence of the Fluff Principle and the lack of barrier between subs. However in the Fediverse you can somewhat avoid it, by not federalising instances together.
In the meantime, if you enjoy both shitposting and serious discussions, nothing prevents you from accessing both instances separately.
why are communities not enough to separate alicelemmy from boblemmy?
after all, a user could want to participate in both
inb4 sorry, wall of text. [Also, note: this is my personal take.]
I think that communities are not enough because of a few things.
One of them is that most people expect to be able to behave the same way, abide to the same rules, and contribute the exact same way, to have the same level as expertise, as long as they're in the same site. Sometimes this is not of the best interests of the group.
You see this a lot in Reddit, and I believe to be one of the main factors behind large subreddits going downhill, no matter the best efforts of their mod teams. r/linguistics is a good example of that - the sub was supposed to be for people at least familiar with Linguistics, sharing information, but most posts and comments there nowadays are from laymen assuming shit out of nowhere, because that's how your average redditor behaves.
You could follow the local rules, sure; but most people will not. Unless there's a higher degree of separation between both group.
Across instances however it's clearer that you're in a different site, with different rules, that you may need to behave in a different way. And that a contribution that may be welcome in one instance might be harmful for another.
Another is that different instances host different demographics. My example is too mild to show it, but imagine the following two instances instead:
If you're the admin of one of the instances you definitively do not want people from the other instance. In charlielemmy this would make the environment unsafe for its target userbase; for danlemmy it means that you're going to get people pissed at the dark jokes, and potentially starting arguments.
Federation makes it easier to handle: register in both alicelemmy and boblemmy.