Can someone explain BU (and other implementation's) "Automatic Chain Pruning" feature? If a node prunes automatically, how do new nodes get bootstrapped?

Are operators who configure BU nodes to automatically prune hoping that someone else will keep the full blockchain to bootstrap new nodes?

submitted by /u/mrtest001
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source https://www.reddit.com/r/btc/comments/i3e4vh/can_someone_explain_bu_and_other_implementations/