This is the most devastating thing about the hack, not the hack itself or the site being down but the confirmation that everything is outdated as shit and nobody could be bothered to maintain the site ever since Hiro bought it, and information about the specific ways in which the site is shit. There's undoubtedly plenty of other exploits just waiting to be discovered, Null even spitballed about one himself:
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This is not going to be the last time 4chan is compromised. They're not competent enough to do the full rewrite from scratch that 4chan needs.