Most of the clients I've used could do that (Connect, Voyager, Sync). You just have to go and look through the settings. Also the Lemmy web UI can hide read posts too. Just go to your account settings and untick the "show read posts" option
But still shows the display name (if a user has one) before the instance tag though. What OP meant I guess was just showing the original username (even the user has set a display name)
No. It isn't about the torrent with most peers. It is about the source and the uploader. As someone has already mentioned it, it is about the Reputation!
Naive