No, Mastodon isn't necessarily de-centralized.
I mean, you're probably using it as a de-centralized service, but not everyone is.
Truth Social uses Mastodon.
Truth Social is centralized.
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@atomicpoet interesting point. So you can run Mastodon with ActivityPub turned off?
I assume you can horizontally scale an individual instance. If you do this, do the servers sync with ActivityPub, or use something Mastodon-specific?
@acjay I have never tried to scale a Mastodon instance with federation turned off.