korvys is a user on octodon.social. You can follow them or interact with them if you have an account anywhere in the fediverse.
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@udellgames Instances are like email servers. They just host you, and you follow their rules, but in theory, they also protect you (if an instance refuses to ban nazis, for example, they'll stop federating it), and can theoretically run a different version of mastodon with different features.
