I think a good way to differentiate instances would be if the mastodon layout were to include an avi pic in the top left corner, specific to the instance.
@kevin_redacted could literally be the favicon if people set favicons
@kevin_redacted I literally invented that for my server, except in top right, haha. https://mastodon.social/media/4sLj7l0Jlqvm-WxZsBM
The original server operated by the Mastodon gGmbH non-profit