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.
Reddit and it’s users are good at hyperfixating on a topic and building a community around said topic, with different skill levels. Therefore if you want to also participate, you can simply look up a subreddit for that topic and nearly instantly get answers to your questions and tips on how to start.