My quick troll google came back with 10TB
https://www.gamesradar.com/this-wd-hard-drive-can-hold-the-entire-game-pass-library-4-times-and-still-have-space-left-over/
I fit squarely in the normal category. My storage consists of family pictures my wife takes and stupid pictures of my friends, food and sometimes the kids…largely isolated to phones with a 2TB apple family share plan (because wife maxed out 200GB). I stream everything, use my friends youtubetv account for sports and generally have a pretty low data footprint outside of phones.
Except gamepass…always close to capacity on the Xbox between stuff I try and stuff my kids play (doesn’t take much). To get around this pain, I upgraded to a 2 gbps which moved Xbox downloads from 300-500mbps to 800-850mbps. I don’t swap games often, but like downloading faster than my friends when we’re online together. Obviously not super rational.
It doesn’t seem like I’m in the target market, but if I paid $30/month more for bandwidth that really doesn’t benefit me much, I’d think an option to save that by just having all games might make sense. I’m a middle aged idiot though so probably not or I’d have bought more storage already.