That’s because your original post says you get capped at 500GB... of course you don’t notice anything if you use just 100GB.

A lot of us need unlimited data so we can bittorrent our linux isos.

Abuse isn't necessarily required to surpass any caps. If you have teens, they will be streaming their games and such. They can stream for hours at a time which quickly adds up. Discord video streams average about 5GB/hr. I was often passing the 1.2TB/mo cap on Comcast and had to negotiate a plan that allowed for speed and no cap. That is even before factoring in game updates which as massive these days. I was under the impression that by now games would dynamically render textures using formulas, but alas... the games are getting exponentially bigger. And gaming platforms are not optimizing downloads to share between users on a LAN, so update bandwidth usage is multiplied by number of people playing the games in the home. I share some blame on that one. Back in the day when it was just me and I played only one game, I too stayed well below any limits.