When Sync for Reddit show a popup promoting Sync for Lemmy, it should also point to this kind of service, to ease the migration. It would also be nice, if sync for Lemmy also had a shortcut.
Besides that a link to a more general community directory like https://lemmyverse.net/ would be nice to have.
Looks like the sub.rehab project is no longer active.
A “spiritual successor” to this project has been created by @rglullis@communick.news over at https://fediverser.network/communities