For games like Baldur's Gate 3 that means you can only have a handful of cloud save files, they are like from 10 to upwards 40 MBs each. And that's a game where a lot of people doing save/reloads for each fight, decision etc.
In Baldur's Gate 2 it would keep repeating "you must gather your party before venturing forth" if you wanted to transition to another area but one of your characters got stuck, or was tons faster than the rest (boots of speed). It was pretty annoying.
About ten years ago I found the developer who added that so I kicked him in the head till he was dead, gnahahahaha.
I was amazed too! 40 Mb for a save file is astounding, a thousandth of the Kiwix package of the whole text of Wikipedia. How many objects is it saving?
Also probably good time to mention Ludusavi, rclone based all in one save file backup system https://github.com/mtkennerly/ludusavi