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I’ve been using phtn.app, which defaults to lemm.ee.
Though I think a big difference between the fediverse/activitypub and bluesky/atproto is authentication. If you want a centralized app, you gotta have a centralized identity server. Otherwise you’re freely giving your login credentials to a random server, which we as a society decided was a bad idea.
I can see a possible solution involving OAuth, which I believe Mastodon is able to support. See the relevant GitHub issue at LemmyNet/lemmy#1368
They obviously haven’t visited https://old.lemmy.world/