It’s more nuanced than that. If they look at your profile from a mastodon/etc instance, they’ll see the post. If they are on an instance that has someone who follows you and watch the federated/globel feed, they’ll see the post. And a few other specific situations.
Anyone who follows you across the fediverse can see the post
So people have to explicitly follow me to see the post? It doesn’t show up on feed like mastodons?
It’s more nuanced than that. If they look at your profile from a mastodon/etc instance, they’ll see the post. If they are on an instance that has someone who follows you and watch the federated/globel feed, they’ll see the post. And a few other specific situations.