For me, it’s a few things.
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A way to burn time that doesn’t feel like a digital sugar rush.
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Support, camaraderie, and kindness, primarily from /r/stopdrinking.
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Niche stuff, like ideas for local hiking and backpacking trips, propaganda posters, and kayaking info.
I’ve been looking networking/hosting types of communities. So far I’ve found selfhosted@lemmy.world, datahoarder@lemmy.ml, sysadmin@lemmy.ml. Not sure about Judo but don’t forget you can always create a community!