Y'all remember the PSX emu Bleem! ? You could buy it commercially as a physical disk from the shelves of a store? I have no idea how they got away with it but that seems unthinkable these days.
I feel like, based on the interface, they just took PCSX, swapped the splash screen, and somehow distributed it commercially, along with even running TV ads. They must've been sued into oblivion by Sony.