While I understand the concept of federation I’m unclear as to what it actually entails at a technical level. When lemm.ee eventually shuts down, will all of that user content (posts, comments, votes, etc) cease to exist? Is it mirrored on other instances?
All the images disappear, since they are just links on remote instances.
A copy of all the accounts, comms, posts and comments stay on any instance around to recive them, but they are not fetchable.