GTA 6 will support Remote Play on day one.
PlayStation Remote Play ✅
Xbox Remote Play ✅
Xbox Cloud Gaming ❌
So you can play it on your phone, iPad, PC, or PS Portal as long as your console is on somewhere else.
Basically, the console does the heavy lifting and streams GTA 6 to your device.
Honestly, I’m cool with this. I use Remote Play from time to time anyway. Cloud streaming will probably take its time.