For me, communities are like subreddits and they simply empower more specialized content. The crypto and finance domain is too vast and focusing on one thread of it that some might more be interested in than others is a feature that comes handly in the ocean of information.
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I agree. While technically they are not, it's important how the user sees the information because it's difficult to find what you are interested in in a sea of unrelated niches, inside crypto or financial.