I know Stadia is shutting down and I am sad to see it go, but I made the mistake of cancelling my wife's account just to switch over to mine. Now Google Stadia has blocked reactivation and I can not access either of our claimed games. This is saddening. It would be nice if Stadia would at least allow all users to access their claimed games till the end.
I'm in a similar situation. I've let my pro subscription expire right on september 29th to check a few games on the Ubisoft+ trial. I was about to return to pro soon in October. I still had a few games I was willing to try on that list. I even have a pending save game in Spirit Farer and I'll probably never finish this game if I have to rebuy it and restart it from scratch elsewhere. I also bought the expansions of orcs must die 3 which I have access to in theory until January, but I'm locked out of the main game so they are unusable.
I don't care much for 4K as I play on my old-ish computer screen which does not support it anyway, but accessing the pro game library would make a difference. Since the launch of the free tier, I don't think I've missed claiming any pro game. I wouldn't mind paying for the months that I use even if there are no new releases.
That’s all really sad and I wish they would change their mind and let us have access to our pro library.