Generally there was a question about whether it would be possible to subscribe to the community anonymously?
It's just that transferring content between servers in #Fediverse doesn't quite work the way one wants it to.
Hi there! The links in your text lead away from the user's instance, here are fixed links that stay on each user's instance: !jerboa@lemmy.ml
Not sure what you mean by anonymously here. There's not a ready list of subscribers for a list, though it can be seen in a site's data. Account migration isn't there yet but you can subscribe to the same communities from any instance assuming there's no federation issues at one of them.
You can generally read from a community without subscribing too, but to post of course you need to either subscribe remotely or be logged in on the home server of the community, otherwise we would end up with a bunch of 4chan style 'anon' posts.