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.
In addition to what’s been said already - the community-specific wikis and megathreads. The amount of information I could find there about sometimes very niche topics was amazing. Hopefully something similar will be possible with Lemmy.