A more famous example was back in 2011 when Iran brought done a US surveillance drone by spoofing the GPS location. They clam that the data sent to the drone confused it and made it land at what it thought was home base. But instead it ended up in Iran.
Even if SkyJack no longer works it will not be the last hacking attempt on civilian drones. Given a new piece of technology with restrictions the first thing people want to do is break it and make it do something else. In Colorado there was a proposal to have a Hunting License to shoot down drones. This now prompts an arms race between hackers and drone security personnel.