More data moves in your average playstation system update than that. Steam probably transmits more in a morning than that
Valve published some numbers of this.
11.42 petabytes per hour, and roughly 190,000 GB per minute and 100 exabytes delivered in 2025.
There are far more Google Chrome users than probably PlayStation & Steam users combined.
Also, someone installing Steam is going to expect large downloads, hell, the platform tells you the size as you're about to start the download.
I don't think anyone expects a browser to suddenly download 4GB, let alone behind their backs!