PSA: You should know that Settings > Migrate Subreddits exists. All you do is login to your old Reddit account, copy a “multireddit” link, paste it in Voyager and you’ll be able to search the fediverse for those topics/communities to subscribe to.
You may find communities that are missing here if you’d like to run/manage your very own community on a topic you enjoy.
Hope this helps. I just found this feature today and subscribed to a bunch of communities.
Does this give Lemmy or WefWef (Voyager) your Reddit credentials?
No, it just takes a multi Reddit link that you paste, and for each subreddit, it will search for alternatives across the Fediverse.
You can select them one-by-one and subscribe to any you fancy.
No - you copy-paste a link that encodes the list of subreddits you were subscribed to, you could copy it from another machine entirely if you wanted
Nope. The multireddit link itself contains the subreddit names. All Voyager has to do is simple string parsing to get them.