imho, Nintendo had a hard enough time with preventing piracy and unlicensed games with the NES and SNES and saw the PS1 got modded within a year, even with the special black coated discs to hide the tracks. There wasn’t a lot of optical/compact disc copy protection magic at the time and, cd-rs and writers started getting popular quickly as well. ps1 in 1994, n64 in 1996, backwards Dreamcast GD-ROMs and beginnings of larger discs and DVDS in 98.
> I agree that the PS1 had more piracy, but I'm not sure that actually diminished its success?
At least in my corner of the world (Spain), piracy improved its success. Everybody wanted the PSX due to how cheap it was, I think it outsold the N64 10:1.