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Yes, #BlueSky, a "crawling indexer" is exactly what I want in my social media:
https://atproto.com/guides/overview#achieving-scale

Note that the crawling indexer is made necessary for things like "likes, reposts, followers".

As in, a crawling indexer is necessary for basic functionality of BlueSky, apparently.

Compare to #ActivityPub, where no such hard requirement exists, even though a service that relies on crawling to provide recommendations (for example) could exist.