1) The document discusses the history of jailbreaking methods for the PlayStation 3 from the earliest exploits using BlueRay Java and OtherOS to more recent jailbreaks enabled by code leaks and hardware dongles.
2) A $100+ USB dongle enabled a jailbreak in 2013 but was blocked by a firmware update from Sony; however, this allowed backups of existing games.
3) By the end of 2013, code leaks enabled new jailbreaks that allowed homebrew and PSN access but also increased online cheating until Sony shut down PSN for two months; newer jailbreaks have aimed to access the latest games and firmware.