Nope, this was an official, legally sold product. Came with a keyboard, mouse, 40gb HDD, and PS2 ethernet adapter. Required an 8MB memory card to function and installed via command line. It's a pretty cool piece of history.
The operating systems from the PS3, PS4, PS5, 3DS and Switch and Mac OS are based on FreeBSD. The Wii U probably also runs something based on FreeBSD.
Linux for the PS2 is based on Red Hat.
Chrome OS is based on Gentoo