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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 actually like cryptocurrency and think it has many good use cases, but this is not one of them. Crypto is designed for trustless, decentralized systems. Steam is centralized, so there's no need for that trustless economy.
If there were ever a similar library which was open source and run by the people, then potentially crypto would be viable for that system, but for Steam it's simply unnecessary.