@mosseri: The current plan is you'll have to have a public account and explicitly opt in to your content being available on other servers. This is consistent with what other large players like WordPress are doing, but somewhat controversial within the Mastodon community. If we end defaulting people in, we'll absolutely offer an opt out, but we're not currently moving in that direction.
https://files.mastodon.social/media_attachments/files/111/590/712/204/194/554/original/3545726eff9dcc12.jpeg