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I see you posted this article to 4 communities. According to the comments on this post if you use the cross post function (in the default web frontend), it will only show once in the feeds instead of 4 times (which can be a bit annoying).
I did use the cross-post function. Most apps do not currently acknowledge this function which might explain why the article has appeared to you multiple times.
I see content from many servers in the lemmy federation. My understanding, which could be wrong, was that like email, you can post to any domain and see posts from other domains. What's the advantage of posting to many instances?
More traction just like posting in reddit to multiple subreddits. People might not be subbed to the one you post it to and not everyone browses All and even if they did you would have to hope it floats to the top more.