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Wouldn't you then not be able to see replies from anyone besides the dozen accounts your relay follows too? If I run a personal Mastodon instance and someone replies to one of my posts, their instance will send it directly to mine and I'll see it. My understanding of the ATProto architecture is that it doesn't support directed messaging like that.

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The cost for consuming the firehose of the entire network is very low. So the actual cost that can blow up is storage and computation.

If you want to filter for events based on some heuristic (e.g. only from follows of server list), you can do that. You can then specialize that further. E.g. for ongoing threads that already pass your filter, you could add their IDs to an array, and accept all replies for those threads as well into your DB.

You already get a stream of everything so you can scale down what you write to DB to exactly the characteristics you need. Including keeping threads cohesive.

To refer back to the comment I was replying to: is that the sort of thing you could realistically run on a raspberry pi? At home?

Yeah! In fact some popular ecosystem services are (or at least have been) running on Raspberry Pi. See here: https://bsky.bad-example.com/can-atproto-scale-down/

Also the best algorithmic “For You” feed on the app runs off someone’s gaming computer at home

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