> The "pick any server, it doesn't make any difference, you'll see _all_ messages anyway" -- is not realistic given that each fediverse node administrator can exercise their freedom to choose what messages their server accepts.

That is true, but most Mastodon apps make multi-accounting a breeze, and I imagine the Lemmy ecosystem will provide the same functionality.

It also helps that Lemmy is trying to court the userbase of Reddit, who are already a pseudo-anonymous lot and in my experience don't seem to have as much of an attachment to their old content as Twitter users, deleting their old posts and accounts on a regular basis.