HP will pay hackers up to $10,000 to break their printers July 31, 2018 https://www.cnet.com/news/hp-will-pay-hackers-up-to-10000-to-break-their-printers/
How Hackers Hit Printers August 31, 2018 https://www.darkreading.com/risk/how-hackers-hit-printers-/d/d-id/1332715
HP Offering Big Rewards for Cartridge Vulnerabilities October 1, 2020 https://www.securityweek.com/hp-offering-big-rewards-cartridge-vulnerabilities