It would already be bad if they only used a "global" server for content discovery, but no, they also use that for the normal feed building anyway, instead of the outbox model.
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Some independent dude over there just made a proper relay that (if I understand his thread right) the entire BlueSky AppView could theoretically run off of—and the relay cost per month would only be like $20. (An AppView of the size of bsky.app is always gonna be hecka expensive, so cost of running the AppView another thing altogether, but on the relay side that's pretty interesting.)

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fig (aka:[phil]) (@bad-example.com)
your point of tens of millions
its like $20USD/mo (i massively over-provisioned disk), and any full-scale bsky app could run off it. like literall...
That's interesting, but it's deleting data after 48 hours and having trouble connecting to 40 PDS servers?
How does it decide what users it will fetch posts from?