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When Baldur's Gate 3 came out, Steam's overall bandwidth consumption went from around 18 Tbps to 146 Tbps
(reddthat.com)
From Steam's self-published stats.
Baldur's Gate 3 could not be preloaded and weighed in at 125 gigabytes on disk, so when the game left Early Access at 11am US Eastern yesterday, Steam's bandwidth utilization shot up 8x over a span of 30 minutes. I know personally, I saw my download hit over 600 Mbps across a 1 Gbps fiber connection.
Kudos to the system engineers at Valve. It is mind-boggling that they have built infrastructure that robust.
As in DVDs or Blu Rays?
Computers running for hours just downloading, servers running hot to share the files, extra bandwidth in use - certainly not free.
But in contrast to producing optical media, burning data onto it, printing a cover, sticking it in a plastic box, sticking that plastic box in a larger box with polystyrene peanuts, putting that box with other boxes on a pallet, wrapping them in shrink wrap, flying them across the world, discarding the wrap, breaking down the pallet, driving individual boxes around a region, having an employee come to the store early by car to unload boxes, and have them put individual game cases on display on metal shelves and then lighting and air-conditioning said game cases for a few weeks until they're all sold to customers who drive to and from the store, and then run it on their local computer... Download has got to be more efficient. Certainly when most games then have an update to the disc version already required to download by the time the customer gets home.
The vast majority of the distance covered is using light as the transmission medium, so we can't really get much more efficient than that.
Just a note that commercially produced disks aren't burned they're pressed. I'm not sure which is better environmentally however.
This guy life cycle analysis