If you delete the game and then reinstall it a year later... all your saves will be there waiting for you.
That might be nice... except back when I had a bunch of those saved games I always ended up deleting them because I couldn't remember why I saved them in the first place.
I think I was trying to approach the game like it was "choose your own adventure" or something, and figuring I'd just go back to the "previous page" if I didn't like how things turned out.Of course, that didn't take into account the fact that it would take hours or even days before I really found out where a particular choice would take the game. I never felt like reliving everything I'd just gone through in Civilization with just a slightly different path, so I'd just end up deleting the saves.
Back to what I was saying - even in "real life" I don't use "the cloud" for anything. (Except, obviously, email - which many people don't realize was the original "cloud service" decades ago.) I'm notorious here for resisting the impulse of having everything "on the cloud". Syncing the phone stuff via iCloud, storing photos, uploading bookmarks and reading lists, archiving my music, backing up hard drives - I refuse to use cloud services for any of that stuff, so using it for games? Not going to happen.