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I noticed that too, I imagine it’s something to do with the Lemmy software, I have no idea how it is calculated on a technical aspect, but I generally just ignore it as it’s mostly unhelpful.
https://github.com/LemmyNet/lemmy-docs/blob/main/src/contributors/07-ranking-algo.md has some info on that but seems to be focused on post/comment sorting. Maybe community sorting uses a similar mechanism but this isn’t clearly mentioned in the documentation.
edit: trending communities are local communities sorted by “hot” ranking, which is calculated using the logarithm of the number of subscribers and pulled down by the time the community existed.
Oh good you found it, thanks. I was using the wrong keywords when searching their GitHub.
