this post was submitted on 20 Jun 2023
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It's not quite that straightforward. There's some non linear network effects -- as more communities emerge, each instance is likely to be pulling content from more and more communities. Thus the storage costs along will baloon, and the instance to instance communication will baloon, but not necessarily scaling with user count. It's not likely to be scalable in the long term, if my math is correct.
It'd be like each subreddit having to make a copy of the entire reddit database, over the network, to participate in reddit. Works on a small scale. Fails badly if the community is too large.
Does it have to be that way? Excuse my lack of fediverse and general networking knowledge, but couldn't a user instead retrieve the data directly from the instance a post is hosted on without their instance needing to interact with it at all?
I see how there's limited scalability in the example you provide, but I feel like it shouldn't be necessary for each instance to make their own copy of things and rather have the user get the data directly from the host instance.