mastodon.social is one of the many independent Mastodon servers you can use to participate in the fediverse.
The original server operated by the Mastodon gGmbH non-profit

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gergo

@aral the problem is that as long as deploying an instance is not zero effort (which it never will be), there will always be end users (most of them in fact) who rely on centralisation - simply because they wouldn't be able to do it on their own. turning this around: if you don't optimise for scale, you lock these end users out.