For developers, the lesson is simple: That Slack channel your intern uses? That legacy build server from 2016? They are liabilities.
For years, Unity had been quietly moving toward a model. They discontinued their "Unity Reference Source" (a limited view-only version) in 2018 specifically to protect their IP. Unity Engine Source Code Leak BETTER
"Cheaters are going to reverse-engineer every anti-cheat system! Every mobile IAP hack will be undetectable! The Switch emulator developers just won the lottery!" For developers, the lesson is simple: That Slack
But today, the engine still runs. The games still ship. And somewhere, in a dusty corner of a hard drive, those 13 gigabytes sit as a monument to the most dangerous force in software development: Unity Engine Source Code Leak BETTER