GOG has has some strange calculations it performs for free space, particularly for its offline installers. One of the Cyberpunk 2077 updates required 400GB+ free space to install a sub 50GB patch, which was ludicrous and I think under-reported due to most using the Galaxy install process.

Fast internet is not that ubiquitous. There are plenty of people in rural and even urban areas with 16 Mbit or less even in developed countries. Game downloads are extremely frustrating to some friends of mine because it takes literally 20 hours to download sometimes.

You can't mean it in a way where someone wants to play a game and you need to DL 30 or 100 GB before it will let you play today.

I sort of get it if this was some unimportant background download being done, but for a game you actually would like to play, you are stuck with "you should have started your computer 2-10-20 hours before actually wanting to play" depending on how fast your "Fast internet" is.