If HZD isn't the only one and they open the gates for real they would get tons of negative PR for holding the games hostage on just one platform, it would be like having a 3 year timed exclusivity deal on every game, and people are angry even by timed exclusives on Epic Store :PThis right here.
"Go on, play our exclusives 3 years after they were released on our hardware, or, you know, buy a ps5 to play them 3 years earlier"