Bluesky feeds are a filter on the content. They look for particular keywords or exclude keywords, and if your note fits to that set, and you're allowed on the feed as a user, they add your post to the feed. This is the same way a topic relay can work, like https://christpill.nostr1.com

>>Feeds offer some of the same functionalities as hashtags, lists, or communities. A feed is simply a curated list of posts on Bluesky. The curation can be done fully openly, as with a feed that searches for any keywords and automatically indexes them. (This can approximate hashtag behavior and some feeds are keyed to hashtag-looking keywords, like #LandBack.) Feeds can also display all posts from some users or some posts from a pre-screened list of users.<<

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The main difference is that Bluesky probably only has one "bread baking" feed because they only have one big note-faucet that the feed filters notes from. So, if you get banned from that feed or from the faucet, then you can't just spin up a different relay with a new feed. You just have to talk about bread by yourself, from then on.

Hmm I'm not sure about the technical side of Bluesky feeds either, but they seem to be user-made (?). In my play about on Bluesky I have seen several film feeds (one uses all notes that add a 📽️ emoji to select from, and the moderate for eg).

But yeah I'm not sure about anything :)

Bluesky feeds are curated. That's why they seem to work better and have higher signal. The data gets pushed through a filter, basically.

DVMs do something similar, but instead of doing it continually, for everyone receiving the feed, you send off a request and they run the filter for you, especially. That's why it's called a "Data Vending Machine". That's more personal, but also more resource-intensive. Makes more sense to do use that tool for more complex and uncommon combinations, than "show me the feed about baking" or "show me the top ten notes on the biggest 10 relays".