After reading through various dmoz threads:
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webmasterworld.com...]
[
webmasterworld.com...]
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webmasterworld.com...]
I see one notable topic not covered: why sites my disappear from the directory.
It's not always editors that do it. You see the core of dmoz languished for decades. Various editors built tools external to dmoz, one of which is a quality check which gets run at somewhat inconsistent intervals.
Sites that are down for two scans in a row are removed from the active directory. It can take months, years or decades for an editor to notice and fix the problem. The goal is if the site was down, perhaps it needs to be revisited by a human.
I've rescued dozens of sites from this purgatory, and seen perfectly functioning sites that sat unlisted for two...three...five years.