Because Sony owns the copyright to this code, emulator developers cannot include it in their software without facing massive legal consequences.
For years, the BIOS was an absolute requirement. If you didn't have the .bin file inside that .zip , your screen stayed black. PS2_BIOS.zip
The BIOS (Basic Input/Output System) is the proprietary code Sony wrote to start the console and tell it how to read a disc. Because Sony owns the copyright to this code,
The story of this file is defined by a strict legal boundary that most users quietly ignore. PS2_BIOS.zip
This created a ritual for millions of gamers: downloading the emulator, then embarking on a "quest" to find the elusive PS2_BIOS.zip file online. ⚖️ The Legal Tug-of-War