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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.
I always wanted to start a let's play channel where a just play a random game from my libraryb every time. I have so many I never even touched
IIRC there is a website that does this with your library if you log in with steam. It just picks a random one from your library, and you may even be able to set filters or pick a specific collection.
https://thewheelhaus.com/