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Here's what interests me: obviously on a single instance you need to scale the infrastructure as more users join. But how much do you need to scale to account for the usage of federated instances?
I ask that because the answer in this thread is broadly "it's sustainable because each instance is low cost, and you can always add more instances" but that doesn't work if, after the number of instances grows 100x, all existing instances face an increase in costs even if they didn't gain many more users, because they're receiving more messages from federated instances, and need to download and store stuff from those other instances for their local users.
You mean say I have an instance with 100 users.
If they all hang out on communities on the server (more or less), no problemo at all.
But if they all roam around and sign up on thousands of active communities on other servers, my server will be under water.
I love thinking about stuff like this (P=NP, complexity, etc) and I do not see very much about that concerning the lemmyverse which is IMO a shame.
I'm planning setting up a Lemmy build so I can tinker around with it, but you know, time and stuff. I also spent a lot of time just setting up the docker version so maybe it's quite the job :-)