Free Horizon Zero Dawn PS4 Version without any purchase.

I was randomly checking my games library on my ps5 and I saw that I have HZD PS4 version in my library available for download. I never purchased it. Heck I never even logged in to a PS4 ever. Was it given away as a freebie to everyone???? I'm super confused because there is no way I paid for it as I have enabled password mandate for purchases on the PS store.