Archive Program director here. One of the most interesting things our advisory committee told us is that it's really hard to determine what's important in advance: history is replete with lists composed by wealthy people of the books they thought most important, carefully preserved for posterity, whereas what modern historians _really_ want is ordinary people's shopping lists, of which almost none survived. That's one reason we cast a wide net and archived millions of repos instead of eg just the most-starred 100K..Even seemingly trivial repos might collectively be the modern technological equivalent of Renaissance shopping lists, for the historians who may take a particular interest in this (possibly) especially wacky and volatile era.

I wonder how much space you'd save if you excluded repos with only 1 star or only 1 commit.