@codesmith @jonah
To date, nobody has come up with a scheme for migrating content that would actually work in a way most people would expect it to work.

That's because most people would think of migrating content as bringing replies and other interaction with it, which is impossible because replies refer to the original post at the original instance. This is fundamental to the protocol.

There are ways to import your old content into some instance software. But they would show up as orphaned posts, disconnected from any interaction they previously had. This isn't something that a simple software change can fix.