I have a dumb question about the fediverse.
Suppose someone makes their own personal instance. Federation is opt-in? So they have to click a button for each of the seemingly thousands of mastodon instances to get them on their "global" feed?
Or it's opt out, so they start with a hellscape of Nazi instances and have to remove them one by one?
And do the other instances have to also opt in? Are the admins of every instance needing to do something every time a new instance comes online?