There were multiple free public CDNs, multiple versions of jQuery, cache evictions happen much faster than you're thinking, users had less RAM and disk in the p

There were multiple free public CDNs, multiple versions of jQuery, cache evictions happen much faster than you're thinking, users had less RAM and disk in the past. I can only imagine "naturally" producing this scenario by browsing HN in 2010 and clicking every link on the front-page and hoping at least 2 were indie blogs or startups that don't take security seriously, and even then if they're not consecutive, the website between them would have likely evicted the cache.