I got a voucher for one month "GeForce NOW Priority Membership" from Ubisoft "because of the Stadia Shutdown".... no idea why.
Since the GFN servers in Frankfurt are already upgraded to RTX 4080 I activated the voucher, then upgraded to GFN-Ultimate for 20 € and then cancelled the subscription immediately. The GFN priority month was credited with 15 additional days, so the next 45 days I can try out "Geforce Now RTX 4080".
My first games will be Portal with RTX, The Witcher 3 with RT and Cyberpunk 2077 with RT Psycho... maybe also an Ubisoft game